IJmuiden Project - Fred Cottaar, José Verbeek, Maarten van Kleinwee & Mars Muusse
(last update: January 01, 2023)
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| Y.AUD |
| NLA 5.422.599 |
| Lesser B-backed Gull |
| female, adult |
| ringed: May 23 2011 |
| Forteiland IJmuiden, - |
| Relations: |
| Y.DHN female, partner 2021 |
| male unringed, partner 2018-2020 |
Lesser Black-backed Gull (graellsii) Y.AUD adult, May 2016 - April 2022, IJmuiden, the Netherlands. Picture: Mars Muusse & Maarten van Kleinwee.
Ringed as breeding adult in season 2011 at Forteiland, IJmuiden. Ringed by Fred Cottaar ringing team.
below: Lesser Black-backed Gull (graellsii) Y.AUD >15CY, April 25 2022, IJmuiden, the Netherlands. Picture: Mars Muusse.
below: Lesser Black-backed Gull (graellsii) Y.AUD >12CY, April 29 2019, IJmuiden, the Netherlands. Picture: Maarten van Kleinwee.
below: Lesser Black-backed Gull (graellsii) Y.AUD >11CY, July 09 2018, IJmuiden, the Netherlands. Picture: Maarten van Kleinwee.
below: Lesser Black-backed Gull (graellsii) Y.AUD >9CY, May 01 2016, IJmuiden, the Netherlands. Picture: Maarten van Kleinwee.
Life history until June 2021:
| YAUD | Geringd | 2011 | 5 | 23 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | F & K | Cottaar-Verbeek ringteam | op nest gevangen / 3 ei |
| YAUD | Gezien | 2011 | 5 | 23 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | F & K | Cottaar-Verbeek ringteam | poetsend noordzijde |
| YAUD | Gezien | 2011 | 6 | 27 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred | Cottaar | min. 1 kuiken |
| YAUD | Gezien | 2011 | 7 | 3 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | José & Kees | Verbeek | |
| YAUD | Gezien | 2011 | 9 | 2 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred | Cottaar | |
| YAUD | Gezien | 2012 | 4 | 23 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | José & Kees | Verbeek | |
| YAUD | Gezien | 2012 | 5 | 6 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | F & K | Cottaar-Verbeek ringteam | nestbouw |
| YAUD | Gezien | 2012 | 5 | 7 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | |
| YAUD | Gezien | 2012 | 5 | 25 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | |
| YAUD | Gezien | 2012 | 8 | 27 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | José & Kees | Verbeek | |
| YAUD | Gezien | 2013 | 4 | 22 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | F & K | Cottaar-Verbeek ringteam | |
| YAUD | Gezien | 2013 | 4 | 28 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred | Cottaar | |
| YAUD | Gezien | 2013 | 5 | 6 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | F & K | Cottaar-Verbeek ringteam | poetsend |
| YAUD | Gezien | 2013 | 5 | 13 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | F & K | Cottaar-Verbeek ringteam | |
| YAUD | Gezien | 2013 | 5 | 27 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | F & K | Cottaar-Verbeek ringteam | |
| YAUD | Gezien | 2013 | 6 | 14 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred | Cottaar | poetsend |
| YAUD | Gezien | 2013 | 9 | 1 | haven IJmuiden | NL | 52,46 | 4,59 | Anton | Duijnhouwer | |
| YAUD | Gezien | 2013 | 12 | 9 | Malaga, port | ESP | 36,71 | -4,42 | Salvador | Garcia | 9500 in the harbour |
| YAUD | Gezien | 2014 | 5 | 5 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred & José | Cottaar-Verbeek | ongeringde partner bedelt |
| YAUD | Gezien | 2014 | 5 | 19 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | |
| YAUD | Gezien | 2014 | 6 | 29 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided; ring difficult to read given conditions |
| YAUD | Gezien | 2014 | 7 | 1 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided; ring reported as YAOO |
| YAUD | Gezien | 2014 | 7 | 14 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred & José | Cottaar-Verbeek | |
| YAUD | Gezien | 2014 | 7 | 31 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2014 | 8 | 12 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2014 | 8 | 24 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred | Cottaar | op west, poetsend |
| YAUD | Gezien | 2014 | 9 | 8 | Angeiras Norte-Matosinhos, Porto | PT | 41,27 | -8,72 | Inocêncio | Oliveira | Photo provided |
| YAUD | Gezien | 2015 | 5 | 11 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | M. |
| YAUD | Gezien | 2015 | 5 | 12 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2015 | 6 | 15 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Caroline | Walta | Kolonie Midden. Met 2 pullen. |
| YAUD | Gezien | 2015 | 6 | 22 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | M/ Voert 2 pullen. |
| YAUD | Gezien | 2015 | 6 | 22 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Maarten van | Kleinwee | Vliegend over heli-platform. Nog geen handpenrui. |
| YAUD | Gezien | 2015 | 7 | 11 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2015 | 7 | 18 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2015 | 7 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2015 | 7 | 28 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2016 | 5 | 1 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Maarten van | Kleinwee | Flying over heli-platform |
| YAUD | Gezien | 2016 | 5 | 1 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Maarten van | Kleinwee | Flying over heli-platform. No primary moult. Score: 0 (0000000000). |
| YAUD | Gezien | 2016 | 5 | 15 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2016 | 5 | 21 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred | Cottaar | on west slope, preening |
| YAUD | Gezien | 2016 | 5 | 21 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2016 | 6 | 3 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Maarten van | Kleinwee | Colony center. P1 missing. Score: 1 (1000000000). |
| YAUD | Gezien | 2016 | 7 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2016 | 7 | 9 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2016 | 7 | 10 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2016 | 7 | 13 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2016 | 7 | 17 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2016 | 8 | 18 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Fred | Cottaar | |
| YAUD | Gezien | 2016 | 8 | 29 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | Maarten van | Kleinwee | 11:30 hrs. Colony West with begging juvenile. |
| YAUD | Gezien | 2016 | 8 | 29 | strand IJmuiden | NL | 52,44 | 4,55 | Maarten van | Kleinwee | 1215 hrs. Resting on the beach. |
| YAUD | Gezien | 2017 | 4 | 10 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | territorial, male unringed |
| YAUD | Gezien | 2017 | 4 | 20 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2017 | 4 | 29 | Forteilandkolonie IJmuiden, pier | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | |
| YAUD | Gezien | 2017 | 5 | 1 | Forteilandkolonie IJmuiden, betonpunten | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YAUD | Gezien | 2017 | 5 | 8 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YAUD | Gezien | 2017 | 5 | 19 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | territorial |
| YAUD | Gezien | 2017 | 5 | 22 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YAUD | Gezien | 2017 | 5 | 30 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2017 | 6 | 2 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YAUD | Gezien | 2017 | 6 | 4 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | partner feeds 2 chicks |
| YAUD | Gezien | 2017 | 6 | 12 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | 2 chicks |
| YAUD | Gezien | 2017 | 6 | 19 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | 1 chick |
| YAUD | Gezien | 2017 | 6 | 19 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2017 | 7 | 3 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | 1 chick |
| YAUD | Gezien | 2017 | 8 | 4 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2017 | 8 | 7 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2018 | 5 | 4 | Forteilandkolonie IJmuiden, betonpunten | NL | 52,46 | 4,58 | Fred | Cottaar | preening |
| YAUD | Gezien | 2018 | 5 | 6 | Forteilandkolonie IJmuiden, pier | NL | 52,46 | 4,58 | Fred | Cottaar | |
| YAUD | Gezien | 2018 | 5 | 7 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | choking with unringed partner |
| YAUD | Gezien | 2018 | 5 | 14 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YAUD | Gezien | 2018 | 6 | 3 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | partner on nest |
| YAUD | Gezien | 2018 | 6 | 11 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | With 1 small chick. |
| YAUD | Gezien | 2018 | 6 | 18 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | With 1 chick and unringed male LBBG. |
| YAUD | Gezien | 2018 | 6 | 25 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | 1 chick |
| YAUD | Gezien | 2018 | 7 | 2 | IJmuiden, Forteiland | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | Photo provided. 1 pulus being fed by an unringed partner |
| YAUD | Gezien | 2018 | 7 | 9 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | Photo provided. With unringed LBBG and large young. |
| YAUD | Gezien | 2018 | 7 | 16 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YAUD | Gezien | 2018 | 7 | 23 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YAUD | Gezien | 2018 | 7 | 29 | Forteilandkolonie IJmuiden, betonpunten | NL | 52,46 | 4,58 | Fred | Cottaar | preening |
| YAUD | Gezien | 2018 | 8 | 3 | Forteilandkolonie IJmuiden, betonpunten | NL | 52,46 | 4,58 | Fred | Cottaar | |
| YAUD | Gezien | 2018 | 8 | 8 | IJmondhaven | NL | 52,46 | 4,57 | José | Verbeek-Cottaar | Oost. |
| YAUD | Gezien | 2018 | 8 | 16 | Forteilandkolonie IJmuiden, pier | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | |
| YAUD | Gezien | 2018 | 8 | 24 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2018 | 8 | 25 | Forteilandkolonie IJmuiden, pier | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | |
| YAUD | Gezien | 2018 | 8 | 26 | Forteilandkolonie IJmuiden, pier | NL | 52,46 | 4,58 | Jan | Zorgdrager | Volwassen minimaal 4kj |
| YAUD | Gezien | 2018 | 8 | 26 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2018 | 8 | 28 | Forteilandkolonie IJmuiden, pier | NL | 52,46 | 4,58 | Fred | Cottaar | |
| YAUD | Gezien | 2019 | 4 | 29 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | Female, copulation by unringed male. |
| YAUD | Gezien | 2019 | 5 | 10 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | nest 1 egg |
| YAUD | Gezien | 2019 | 5 | 13 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YAUD | Gezien | 2019 | 5 | 17 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | nest 3 eggs |
| YAUD | Gezien | 2019 | 5 | 20 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | territorial |
| YAUD | Gezien | 2019 | 5 | 24 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | territorial |
| YAUD | Gezien | 2019 | 5 | 27 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | territorial |
| YAUD | Gezien | 2019 | 6 | 1 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2019 | 6 | 2 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | nest, partner unringed |
| YAUD | Gezien | 2019 | 6 | 3 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | territorial |
| YAUD | Gezien | 2019 | 6 | 7 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | territorial |
| YAUD | Gezien | 2019 | 6 | 14 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | territorial, partner unringed |
| YAUD | Gezien | 2019 | 6 | 17 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | begging by unringed male, no chicks seen |
| YAUD | Gezien | 2019 | 6 | 18 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2019 | 7 | 15 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YAUD | Gezien | 2019 | 7 | 15 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2019 | 7 | 22 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YAUD | Gezien | 2019 | 8 | 2 | Forteilandkolonie IJmuiden, betonpunten | NL | 52,46 | 4,58 | Fred | Cottaar | preening |
| YAUD | Gezien | 2019 | 8 | 8 | Forteilandkolonie IJmuiden, basaltblokken/wier | NL | 52,46 | 4,58 | Fred | Cottaar | preening |
| YAUD | Gezien | 2019 | 8 | 10 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2019 | 8 | 21 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2020 | 4 | 11 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2020 | 4 | 15 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2020 | 5 | 2 | Forteilandkolonie IJmuiden, betonpunten | NL | 52,46 | 4,58 | Fred | Cottaar | |
| YAUD | Gezien | 2020 | 5 | 2 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Bep | Scheen | |
| YAUD | Gezien | 2020 | 5 | 2 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Bep | Scheen | Photo provided; with unringed male partner |
| YAUD | Gezien | 2020 | 5 | 4 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Bep | Scheen | |
| YAUD | Gezien | 2020 | 5 | 8 | Forteilandkolonie IJmuiden, betonpunten | NL | 52,46 | 4,58 | Fred | Cottaar | preening |
| YAUD | Gezien | 2020 | 5 | 11 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | Photo provided. |
| YAUD | Gezien | 2020 | 5 | 15 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | |
| YAUD | Gezien | 2020 | 5 | 17 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2020 | 5 | 19 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2020 | 5 | 24 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2020 | 5 | 25 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2020 | 5 | 26 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | territorial |
| YAUD | Gezien | 2020 | 5 | 27 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2020 | 6 | 12 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | With 1 chick and unringed partner. |
| YAUD | Gezien | 2020 | 6 | 14 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2020 | 6 | 15 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | Fed by unringed partner. With 1 chick. |
| YAUD | Gezien | 2020 | 6 | 25 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2020 | 7 | 6 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2020 | 7 | 15 | IJmondhaven | NL | 52,46 | 4,57 | José | Verbeek-Cottaar | Oost/ Poetsend. |
| YAUD | Gezien | 2020 | 7 | 23 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | |
| YAUD | Gezien | 2020 | 8 | 2 | Forteilandkolonie IJmuiden, basaltblokken/wier | NL | 52,46 | 4,58 | Maarten van | Kleinwee | Head-tossing with unringed male LBBG. |
| YAUD | Gezien | 2020 | 8 | 14 | Forteilandkolonie IJmuiden, basaltblokken/wier | NL | 52,46 | 4,58 | Fred | Cottaar | preening |
| YAUD | Gezien | 2020 | 8 | 18 | Forteilandkolonie IJmuiden, betonpunten | NL | 52,46 | 4,58 | Fred | Cottaar | preening |
| YAUD | Gezien | 2020 | 8 | 27 | Forteilandkolonie IJmuiden, betonpunten | NL | 52,46 | 4,58 | Jan | Zorgdrager | |
| YAUD | Gezien | 2020 | 8 | 27 | Forteilandkolonie IJmuiden, basaltblokken/wier | NL | 52,46 | 4,58 | Maarten van | Kleinwee | |
| YAUD | Gezien | 2020 | 9 | 1 | Forteilandkolonie IJmuiden, pier | NL | 52,46 | 4,58 | Fred | Cottaar | |
| YAUD | Gezien | 2020 | 9 | 3 | Forteilandkolonie IJmuiden, pier | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | |
| YAUD | Gezien | 2020 | 9 | 4 | Forteilandkolonie IJmuiden, betonpunten | NL | 52,46 | 4,58 | Jan | Zorgdrager | See Gambia sighting March 2021 of a bird identified as YAUU (could have been YAUD) |
| YAUD | Gezien | 2020 | 9 | 4 | Forteilandkolonie IJmuiden, pier | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | |
| YAUD | Gezien | 2020 | 9 | 5 | Forteilandkolonie IJmuiden, pier | NL | 52,46 | 4,58 | Maarten van | Kleinwee | |
| YAUD | Gezien | 2020 | 9 | 5 | Forteilandkolonie IJmuiden, pier | NL | 52,46 | 4,58 | Fred | Cottaar | |
| YAUD | Gezien | 2021 | 3 | 16 | Kartong Bird Reserve, S Gambia | GAM | 13,08 | -16,75 | Emmanuel | Jatta | Photo provided (perhaps confused with YAUU) |
| YAUD | Gezien | 2021 | 3 | 20 | Kartong Bird Reserve, S Gambia | GAM | 13,08 | -16,75 | Emmanuel | Jatta | Photo provided, ring code confirmed |
| YAUD | Gezien | 2021 | 4 | 11 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Lou | Spoor | Photo provided. With unringed male. Avoids putting weight on right leg. |
| YAUD | Gezien | 2021 | 4 | 12 | Erasmusgracht, Amsterdam | NL | 52,37 | 4,83 | Bep | Scheen | Photo provided, with unringed partner |
| YAUD | Gezien | 2021 | 4 | 25 | Mercatorstraat, Amsterdam | NL | 52,37 | 4,84 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2021 | 4 | 26 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Lou | Spoor | Photo provided. With unringed male. Balancing on right leg (cf. 11-04). |
| YAUD | Gezien | 2021 | 4 | 27 | Forteilandkolonie IJmuiden, basaltblokken/wier | NL | 52,46 | 4,58 | Jan | Zorgdrager | |
| YAUD | Gezien | 2021 | 4 | 28 | Forteilandkolonie IJmuiden, betonpunten | NL | 52,46 | 4,58 | José | Verbeek-Cottaar | |
| YAUD | Gezien | 2021 | 5 | 1 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Lou | Spoor | Photo provided. With unringed partner. Almost continuously on right leg (cf. 11 and 26-4) |
| YAUD | Gezien | 2021 | 5 | 2 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Lou | Spoor | Photo provided. With unringed partner. Mostly on right leg, but walks normally. |
| YAUD | Gezien | 2021 | 5 | 3 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Bep | Scheen | Photo provided, with unringed partner |
| YAUD | Gezien | 2021 | 5 | 3 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Lou | Spoor | With unringed partner. Partner pulling grass. |
| YAUD | Gezien | 2021 | 5 | 5 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Suzan Pluim | Mentz | Photo provided, with unringed male partner, intimate interactions |
| YAUD | Gezien | 2021 | 5 | 5 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Lou | Spoor | Photo provided, with unringed partner. |
| YAUD | Gezien | 2021 | 5 | 7 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Bep | Scheen | Photo provided, with unringed partner |
| YAUD | Gezien | 2021 | 5 | 7 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Lou | Spoor | Photo provided, with unringed partner. |
| YAUD | Gezien | 2021 | 5 | 8 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Lou | Spoor | With unringed partner. |
| YAUD | Gezien | 2021 | 5 | 9 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Bep | Scheen | Photo provided |
| YAUD | Gezien | 2021 | 5 | 9 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Lou | Spoor | With unringed partner, preening. |
| YAUD | Gezien | 2021 | 5 | 19 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | territorial |
| YAUD | Gezien | 2021 | 5 | 31 | Forteilandkolonie IJmuiden, centrale vlak | NL | 52,46 | 4,58 | IJmuiden meeuwen | team | in territory |
| YAUD | Gezien | 2021 | 6 | 6 | Erasmuspark, Amsterdam | NL | 52,37 | 4,85 | Bep | Scheen | Photo provided |