IJmuiden Project - Fred Cottaar, José Verbeek, Maarten van Kleinwee & Mars Muusse
(last update: January 01, 2023)
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| Y.BJC |
| NLA 5.470.688 |
| Lesser B-backed Gull |
| sex?, adult |
| ringed: May 20 2013 |
| Forteiland IJmuiden, - |
| Relations: |
| Y.CWT offspring 2019 |
| Y.CWU offspring 2019 |
| Y.CWV offspring 2019 |
| - |
Lesser Black-backed Gull (graellsii) Y.BJC adult, September 2015 - July 2019, the Netherlands & France. Picture: Jean-Michel Sauvage & Mars Muusse.
Ringed as breeding adult in season 2013 at Forteiland, IJmuiden. Ringed by Fred Cottaar ringing team.
below: Lesser Black-backed Gull (graellsii) Y.BJC >10CY, July 12 2019, IJmuiden, the Netherlands. Picture: Maarten van Kleinwee.
Father g-YBJC with all three chicks: g-YCWT, g-YCWU, g-YCWV.
below: Lesser Black-backed Gull (graellsii) Y.BJC >10CY, April 23 2019, IJmuiden, the Netherlands. Picture: Mars Muusse.
below: Lesser Black-backed Gull (graellsii) Y.BJC >6CY, September 14 2015, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
A continental graellsii population sometimes referred to as 'Dutch intergrades' between British graellsii and Scandinavian intermedius.
Complete moult: P5 fully grown, P8-P10 old.
Life history until April 2020:
| YBJC | Geringd | 2013 | 5 | 20 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | F & K | Cottaar-Verbeek ringteam | op nest gevangen / 3 ei |
| YBJC | Gezien | 2013 | 6 | 14 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred | Cottaar | |
| YBJC | Gezien | 2013 | 8 | 7 | haven IJmuiden | NL | 52,46 | 4,59 | José & Kees | Verbeek | Felison terminal |
| YBJC | Gezien | 2013 | 8 | 29 | Blaringhem (vuilstort), Nord | F | 50,67 | 2,41 | H.J.P. | Vercruijsse | Photo provided |
| YBJC | Gezien | 2013 | 9 | 5 | Blaringhem (vuilstort), Nord | F | 50,67 | 2,41 | H.J.P. | Vercruijsse | |
| YBJC | Gezien | 2013 | 9 | 12 | Blaringhem (vuilstort), Nord | F | 50,67 | 2,41 | H.J.P. | Vercruijsse | |
| YBJC | Gezien | 2013 | 9 | 19 | Blaringhem (vuilstort), Nord | F | 50,67 | 2,41 | H.J.P. | Vercruijsse | |
| YBJC | Gezien | 2014 | 1 | 11 | Malaga, port | ESP | 36,71 | -4,4 | Salvador | Garcia | |
| YBJC | Gezien | 2014 | 1 | 12 | Malaga, port | ESP | 36,71 | -4,4 | Salvador | Garcia | |
| YBJC | Gezien | 2014 | 2 | 16 | Malaga, port | ESP | 36,71 | -4,4 | Salvador | Garcia | |
| YBJC | Gezien | 2014 | 4 | 13 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2014 | 4 | 22 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2014 | 4 | 29 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2014 | 5 | 31 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2014 | 6 | 11 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | opposite to nr 1 Erasmusgracht |
| YBJC | Gezien | 2014 | 6 | 26 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided; opposite to nr 1 Erasmusgracht |
| YBJC | Gezien | 2014 | 6 | 30 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred & José | Cottaar-Verbeek | 1 kuiken |
| YBJC | Gezien | 2014 | 6 | 30 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred & José | Cottaar-Verbeek | 1 kuiken, partner ongeringd |
| YBJC | Gezien | 2014 | 7 | 1 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2014 | 7 | 2 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2014 | 7 | 3 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2014 | 7 | 15 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2014 | 7 | 19 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2014 | 7 | 22 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2014 | 7 | 27 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2014 | 7 | 29 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2014 | 8 | 2 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2014 | 8 | 4 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2014 | 8 | 5 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2014 | 8 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2014 | 8 | 14 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2015 | 1 | 25 | Malaga, port | ESP | 36,71 | -4,4 | Salvador | Garcia | |
| YBJC | Gezien | 2015 | 2 | 22 | Malaga, port | ESP | 36,71 | -4,4 | Salvador | Garcia | sunseeds in the dock and the gulls were totally hungry and excited |
| YBJC | Gezien | 2015 | 3 | 19 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 3 | 21 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 3 | 30 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 4 | 2 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 4 | 9 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided with Norman's ER70 |
| YBJC | Gezien | 2015 | 4 | 13 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred & José | Cottaar-Verbeek | partner ongeringd, territoriaal, grass pulling |
| YBJC | Gezien | 2015 | 4 | 17 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 4 | 20 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Maarten van | Kleinwee | Dicht bij ongeringde partner. Kolonie. |
| YBJC | Gezien | 2015 | 4 | 20 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 4 | 22 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 4 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 4 | 26 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 4 | 27 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Maarten van | Kleinwee | Kolonie. Nog geen handpenrui. Score: 0 (0000000000). |
| YBJC | Gezien | 2015 | 4 | 28 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 4 | 29 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 5 | 3 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 5 | 4 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Maarten van | Kleinwee | Kolonie. Medewaarnemer Caroline Walta. |
| YBJC | Gezien | 2015 | 5 | 4 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 5 | 9 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 5 | 11 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Maarten van | Kleinwee | Kolonie. Nog geen handpenrui. Score: 0 (0000000000). |
| YBJC | Gezien | 2015 | 5 | 17 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 5 | 18 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 5 | 21 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 5 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 5 | 26 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Maarten van | Kleinwee | Kolonie Midden. P1 mist. Score: 1 (1000000000). |
| YBJC | Gezien | 2015 | 5 | 30 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Maarten van | Kleinwee | Photo provided, opposite to nr 1 Erasmusgracht |
| YBJC | Gezien | 2015 | 6 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 6 | 8 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 6 | 12 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 6 | 17 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 6 | 19 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 6 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 6 | 26 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 7 | 9 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2015 | 9 | 14 | Boulogne-sur-Mer, harbour, Pas-de-Calais | F | 50,72 | 1,58 | Jean Michel | Sauvage | |
| YBJC | Gezien | 2015 | 10 | 26 | Mons-Boubert (vuilstort), Somme | F | 50,13 | 1,68 | Roland-Jan | Buijs | Reported as 3cy LBBG ... reading error? |
| YBJC | Gezien | 2016 | 1 | 17 | Malaga, port | ESP | 36,71 | -4,4 | Salvador | Garcia | |
| YBJC | Gezien | 2016 | 2 | 13 | Malaga, port | ESP | 36,71 | -4,4 | Salvador | Garcia | |
| YBJC | Gezien | 2016 | 4 | 2 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, near enormous meat ball dumped to feed birds |
| YBJC | Gezien | 2016 | 4 | 3 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 4 | 5 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 4 | 7 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 4 | 11 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 4 | 13 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 4 | 14 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 4 | 15 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Jan | Zorgdrager | courtship unringed partner |
| YBJC | Gezien | 2016 | 4 | 15 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 4 | 16 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, at the same time as YAWN |
| YBJC | Gezien | 2016 | 4 | 18 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Maarten van | Kleinwee | Colony center, with unringed partner. |
| YBJC | Gezien | 2016 | 4 | 18 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Caroline | Walta | Colony centre |
| YBJC | Gezien | 2016 | 4 | 18 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, together with YACB |
| YBJC | Gezien | 2016 | 4 | 21 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 4 | 22 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 4 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 4 | 25 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | M. |
| YBJC | Gezien | 2016 | 4 | 25 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 4 | 26 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 4 | 28 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 5 | 2 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 5 | 3 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 5 | 13 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | M- Terr. |
| YBJC | Gezien | 2016 | 5 | 20 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 5 | 22 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 5 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 6 | 2 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 6 | 14 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 6 | 15 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 6 | 16 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 7 | 12 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 7 | 13 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 7 | 17 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 7 | 20 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 7 | 21 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 7 | 25 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 7 | 27 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 7 | 28 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 7 | 29 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 7 | 30 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 8 | 2 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 8 | 3 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2016 | 8 | 10 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2016 | 8 | 11 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 1 | 6 | Malaga, port | ESP | 36,71 | -4,4 | Salvador | Garcia | |
| YBJC | Gezien | 2017 | 1 | 7 | Malaga, port | ESP | 36,71 | -4,4 | Salvador | Garcia | |
| YBJC | Gezien | 2017 | 1 | 14 | Malaga, port | ESP | 36,71 | -4,4 | Salvador | Garcia | |
| YBJC | Gezien | 2017 | 3 | 24 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2017 | 3 | 31 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2017 | 4 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2017 | 4 | 8 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 4 | 10 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | territorial, partner unringed |
| YBJC | Gezien | 2017 | 4 | 14 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 4 | 15 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 4 | 17 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 4 | 20 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 4 | 24 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YBJC | Gezien | 2017 | 4 | 28 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 5 | 1 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YBJC | Gezien | 2017 | 5 | 2 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 5 | 8 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | At nest with egg. |
| YBJC | Gezien | 2017 | 5 | 11 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 5 | 12 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YBJC | Gezien | 2017 | 5 | 13 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 5 | 16 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 5 | 21 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 5 | 29 | Forteilandkolonie IJmuiden, noordvlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | feeding 3 chicks, partner unringed |
| YBJC | Gezien | 2017 | 5 | 30 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 6 | 2 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | With 3 chicks in territory. |
| YBJC | Gezien | 2017 | 6 | 4 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | feeding 3 chicks small fish |
| YBJC | Gezien | 2017 | 6 | 7 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 6 | 8 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 6 | 10 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 6 | 12 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | With 2 chicks. Being fed a complete fish, but too big for the young to swallow. |
| YBJC | Gezien | 2017 | 6 | 16 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2017 | 6 | 17 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 6 | 19 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 6 | 30 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 7 | 1 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 7 | 3 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | Photo provided. Feeding processed fish (?) to 2 large young. |
| YBJC | Gezien | 2017 | 8 | 2 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 8 | 3 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 8 | 4 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2017 | 8 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2017 | 8 | 10 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 3 | 8 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2018 | 3 | 13 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 3 | 15 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YBJC | Gezien | 2018 | 3 | 16 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 3 | 17 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YBJC | Gezien | 2018 | 3 | 18 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 3 | 24 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner present |
| YBJC | Gezien | 2018 | 3 | 25 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | With unringed partner present |
| YBJC | Gezien | 2018 | 3 | 26 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | With unringed partner present |
| YBJC | Gezien | 2018 | 3 | 27 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Solitary |
| YBJC | Gezien | 2018 | 3 | 29 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Solitary |
| YBJC | Gezien | 2018 | 3 | 31 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2018 | 4 | 3 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 4 | 4 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 4 | 7 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 4 | 9 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | Photo provided. |
| YBJC | Gezien | 2018 | 4 | 13 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided. |
| YBJC | Gezien | 2018 | 4 | 16 | Forteilandkolonie IJmuiden, noordvlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YBJC | Gezien | 2018 | 4 | 16 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 4 | 17 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 4 | 18 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 4 | 21 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 4 | 23 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | choking with unringed partner |
| YBJC | Gezien | 2018 | 4 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2018 | 4 | 24 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 4 | 27 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 4 | 29 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 4 | 30 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YBJC | Gezien | 2018 | 5 | 4 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 5 | 14 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YBJC | Gezien | 2018 | 5 | 15 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 5 | 18 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 5 | 19 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 5 | 22 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2018 | 5 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 5 | 25 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | Photo provided. |
| YBJC | Gezien | 2018 | 5 | 26 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 5 | 28 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | Photo provided. |
| YBJC | Gezien | 2018 | 5 | 31 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 6 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 6 | 12 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 6 | 13 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 6 | 14 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 6 | 21 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2018 | 6 | 22 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 6 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 6 | 24 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 6 | 25 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 6 | 28 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | 05:00 's morgens |
| YBJC | Gezien | 2018 | 7 | 3 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 7 | 4 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 7 | 5 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2018 | 7 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2018 | 7 | 9 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | Photo provided. With 1 large young. |
| YBJC | Gezien | 2018 | 7 | 23 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YBJC | Gezien | 2019 | 3 | 8 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided. |
| YBJC | Gezien | 2019 | 3 | 11 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 3 | 20 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 3 | 21 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2019 | 3 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 4 | 5 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided; op de gracht is het erg rustig. Er wordt ook niet veel gevoerd. |
| YBJC | Gezien | 2019 | 4 | 8 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | With unringed female LBBG. |
| YBJC | Gezien | 2019 | 4 | 10 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2019 | 4 | 15 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | in territory with unringed female |
| YBJC | Gezien | 2019 | 4 | 21 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2019 | 4 | 23 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YBJC | Gezien | 2019 | 4 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 4 | 24 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 4 | 26 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 4 | 28 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 4 | 29 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | territorial, with unringed parter |
| YBJC | Gezien | 2019 | 4 | 29 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 5 | 3 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 5 | 6 | Forteilandkolonie IJmuiden, duintjes oost | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | copulating with unringed female |
| YBJC | Gezien | 2019 | 5 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 5 | 8 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 5 | 9 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 5 | 10 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | nest 3 eggs |
| YBJC | Gezien | 2019 | 5 | 13 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YBJC | Gezien | 2019 | 5 | 15 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 5 | 17 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YBJC | Gezien | 2019 | 5 | 20 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | nest |
| YBJC | Gezien | 2019 | 5 | 21 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 5 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 5 | 24 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | Fred | Cottaar | Recaptured from 3 egg clutch, male |
| YBJC | Gezien | 2019 | 5 | 24 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | C.J. | Camphuysen | GPS 5491 attached by Shamoun/Camphuysen |
| YBJC | Gezien | 2019 | 5 | 24 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | C.J. | Camphuysen | Photo provided; flies straight back to nest after tagging, frequent fights, tries to walk backwards out of tag |
| YBJC | Gezien | 2019 | 5 | 25 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 5 | 25 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, logger clearly visible |
| YBJC | Gezien | 2019 | 5 | 27 | Forteilandkolonie IJmuiden, noordvlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | nest 3 eggs |
| YBJC | Gezien | 2019 | 5 | 27 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 5 | 27 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2019 | 5 | 27 | Sloterplas, Geuzenveld-Slotermeer, Amsterdam | NL | 52,37 | 4,82 | Lou | Spoor | Photo provided |
| YBJC | Gezien | 2019 | 5 | 28 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 5 | 29 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 1 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 1 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided of foraging bird in enormous garbage chaos |
| YBJC | Gezien | 2019 | 6 | 2 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | partner on nest |
| YBJC | Gezien | 2019 | 6 | 2 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 2 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided of foraging bird eating pizza |
| YBJC | Gezien | 2019 | 6 | 3 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | 1 egg with cracks and 2 chicks ringed (5.453.357/358 + red marker) |
| YBJC | Gezien | 2019 | 6 | 5 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 7 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | 2 ringed chicks (5.453.357/358 + red marker), third chick ringed (5.453.563 + red marker) |
| YBJC | Gezien | 2019 | 6 | 10 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 11 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 13 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 14 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | 3 ringed chicks, one with fish bolus |
| YBJC | Gezien | 2019 | 6 | 14 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 15 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 17 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | 3 ringed chicks |
| YBJC | Gezien | 2019 | 6 | 18 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 22 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2019 | 6 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 24 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | 3 ringed chicks |
| YBJC | Gezien | 2019 | 6 | 24 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 6 | 24 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Lou | Spoor | Photo provided |
| YBJC | Gezien | 2019 | 7 | 1 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | With 3 chicks, ringed that day as YCWT, YCWU, YCWV. |
| YBJC | Gezien | 2019 | 7 | 5 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YBJC | Gezien | 2019 | 7 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2019 | 7 | 8 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | C.J. | Camphuysen | Bird not seen (female feeding chicks) but two chicks cr-YCWT GPS 5797 & YCWU GPS 5951 |
| YBJC | Gezien | 2019 | 7 | 8 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 7 | 8 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YBJC | Gezien | 2019 | 7 | 9 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 7 | 10 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 7 | 12 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | Maarten van | Kleinwee | Photo provided, of parent YBJC (GPS) & sibblings YCWU (GPS), YCWV en YCWT (GPS) |
| YBJC | Gezien | 2019 | 7 | 12 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | With young YCWT, YCWU, and YCWV. |
| YBJC | Gezien | 2019 | 7 | 12 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 7 | 13 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 7 | 14 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 7 | 15 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | With young YCWT and YCWU. |
| YBJC | Gezien | 2019 | 7 | 28 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, difficulties with swallowing |
| YBJC | Gezien | 2019 | 7 | 29 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 8 | 3 | Sloterplas, Geuzenveld-Slotermeer, Amsterdam | NL | 52,37 | 4,82 | Lou | Spoor | Photo provided Logger harness seems to hinder the bird in swallowing a big lump of food |
| YBJC | Gezien | 2019 | 8 | 3 | Sloterplas, Geuzenveld-Slotermeer, Amsterdam | NL | 52,37 | 4,82 | Lou | Spoor | Photo provided, serious swallowing constraints |
| YBJC | Gezien | 2019 | 8 | 4 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 8 | 4 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided; swallowing difficulties solved |
| YBJC | Gezien | 2019 | 8 | 5 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 8 | 5 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Lou | Spoor | Photo provided |
| YBJC | Gezien | 2019 | 8 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 8 | 8 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 8 | 8 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Lou | Spoor | |
| YBJC | Gezien | 2019 | 8 | 8 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided; weer strak in het pak en goede conditie |
| YBJC | Gezien | 2019 | 8 | 12 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2019 | 8 | 13 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YBJC | Gezien | 2020 | 3 | 26 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | GPS download | Receiver station colony | Immediate contact with base station established; return in The Netherlands 17 March (resumption of Asd visits) |
| YBJC | Gezien | 2020 | 3 | 28 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided; in feeding frenzies, logger well visible |
| YBJC | Gezien | 2020 | 3 | 30 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided; in feeding frenzies |
| YBJC | Gezien | 2020 | 3 | 31 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YBJC | Gezien | 2020 | 4 | 1 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YBJC | Gezien | 2020 | 4 | 2 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YBJC | Gezien | 2020 | 4 | 3 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YBJC | Gezien | 2020 | 4 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YBJC | Gezien | 2020 | 4 | 14 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YBJC | Gezien | 2020 | 4 | 18 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YBJC | Gezien | 2020 | 4 | 20 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YBJC | Gezien | 2020 | 4 | 24 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | Photo provided, with unringed partner |
| YBJC | Gezien | 2020 | 4 | 27 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YBJC | Gezien | 2020 | 4 | 28 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YBJC | Gezien | 2020 | 4 | 29 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |