Larus cachinnans

Larus cachinnans in the Netherlands

(last update: October 31, 2021)

Hatching success breeding seasons 2020 & 2021 at De Kreupel.

Ring codes used in breeding season 2020 and 2021 for pulli at De Kreupel. Fledging rate estimated from resightings in the period July 2020 - March 2022.
Note that numbers of resightings may strongly increase when adult birds turn back to the colony (>4CY) in the near future.

In 2020 we ringed 16 chicks, of which 4 (=25%) have been reported (this cohort is now 3CY).
In 2021 we ringed 70 chicks, now also including some Herring Gulls, of which already 25 codes (=35%) were reported back. That is within 10 months after ringing.

*season*	*code*	*metal*	*species*	*nest*	*last observation*	*fledged*
2018		5.517.117	CACH	C island	July 17 2020	Y
2020	p-FA		CACH	K08-20	June 12 2020 ringed in nest		2020 rings:	16
2020	p-FB		CACH	K08-20	June 12 2020 ringed in nest		2020 proven fledged:	4
2020	p-FD		CACH	K09-20	June 12 2020 ringed in nest
2020	p-FE		CACH	K09-20	June 12 2020 ringed in nest
2020	p-FF		CACH	K09-20	June 12 2020 ringed in nest
2020	p-FH		CACH	K09-20	June 12 2020 ringed in nest
2020	p-F1		CACH	K05-20	May 21 2020 ringed in nest
2020	p-F2		CACH	K03-20	May 21 2020 ringed in nest
2020	p-F3		CACH	K03-20	June 12 2020 ringed in nest
2020	p-F4		CACH	K03-20	February 23 2021	Y
2020	p-F5		CACH	K02-20	May 01 2021	Y
2020	p-F7		CACH	K04-20	June 12 2020 ringed in nest
2020	p-F8		CACH	K04-20	June 12 2020 ringed in nest
2020	p-F9	5.545.429	CACH	K07-20	January 15 2022	Y
2020	p-F+	5.545.430	CACH	K06-20	October 04 2021	Y
2020	p-F=		CACH	K05-20	May 21 2020 ringed in nest
2021	p-FG	5.556.706	CACH	XLHD-21	May 14 2021 ringed in nest		2021 rings:	70
2021	p-FJ	5.556.707	CACH	XLHD-21	May 14 2021 ringed in nest		2021 proven fledged:	25
2021	p-FL	5.556.708	CACH	C04-21	May 14 2021 ringed in nest
2021	p-FM	5.556.709	CACH	C04-21	May 14 2021 ringed in nest
2021	p-FN	5.556.710	CACH & ARG	KK-21	May 14 2021 ringed in nest
2021	p-F0	5.556.711	CACH & ARG	KK-21	May 14 2021 ringed in nest
2021	p-FP	5.556.712	CACH & ARG	KK-21	February 27 2022	Y
2021	p-FR	5.556.713	CACH	C06-21	June 11 2021 in nest
2021	p-FS	5.556.714	CACH	C06-21	June 11 2021 in nest
2021	p-FT	5.556.715	CACH	C06-21	October 13 2021	Y
2021	p-FU	5.556.716	CACH	D02-21	December 08 2021	Y
2021	p-FV	5.556.717	CACH	D02-21	November 11 2021	Y
2021	p-FW	5.556.718	CACH	D02-21	May 14 2021 ringed in nest
2021	p-FZ		ARGENTATUS	unknown	January 21 2022	Y
2021	r-KL	5.556.719	CACH	D07-21	September 27 2021	Y
2021	r-KM	5.556.720	CACH	E01-21	June 11 2021 in nest
2021	r-KN	5.556.721	CACH	D07-21	June 11 2021 in nest
2021	r-KP	5.556.722	CACH	D05-21	May 14 2021 ringed in nest
2021	r-KR	5.556.723	CACH	D05-21	May 14 2021 ringed in nest
2021	r-KS	5.556.724	CACH	D05-21	January 08 2022	Y
2021	r-KT	5.556.725	CACH	L02-21	December 24 2021	Y
2021	r-KU	5.556.726	CACH	L02-21	June 11 2021 in nest
2021	r-KV	5.556.727	CACH	L02-21	October 25 2021	Y
2021	r-KW	5.556.728	CACH	L05-21	January 19 2022	Y
2021	r-KX	5.556.729	CACH	L05-21	May 20 2021 in nest
2021	r-KY	5.556.730	CACH	L05-21	May 20 2021 in nest
2021	r-KZ	5.556.731	CACH	L01-21	September 27 2021	Y
2021	r-K=	5.556.732	CACH	L01-21	May 14 2021 ringed in nest
2021	r-K+	5.556.733	CACH	L01-21	May 20 2021 in nest
2021	r-K0	5.556.734	CACH	KA-21	May 14 2021 ringed in nest
2021	r-K1	5.556.735	CACH	KA-21	May 14 2021 ringed in nest
2021	r-K2	5.556.736	CACH	KB-21	May 14 2021 ringed in nest
2021	r-K3	5.556.737	CACH	KB-21	May 14 2021 ringed in nest
2021	r-K4	5.556.738	CACH	KB-21	May 14 2021 ringed in nest
2021	r-K5	5.556.739	ARGENTATUS	M06-21	May 14 2021 ringed in nest
2021	r-K6	5.556.740	ARGENTATUS	M06-21	February 24 2022	Y
2021	r-K7	5.556.741	ARGENTATUS	KC-21	October 16 2021	Y
2021	r-K8	5.556.742	CACH	M01-21	May 14 2021 ringed in nest
2021	r-K9	5.556.743	CACH	M01-21	May 14 2021 ringed in nest
2021	b-D\|A	5.556.744	CACH	M01-21	March 06 2022	Y
2021	b-D\|B	5.556.745	CACH	M04-21	June 11 2021 in nest
2021	b-D\|C	5.556.746	CACH	M04-21	June 11 2021 in nest
2021	b-D\|E	5.556.747	CACH	KG-21/02P4	June 17 2021	Y
2021	b-D\|G	5.556.748	CACH	KG-21/02P4	August 21 2021	Y
2021	b-D\|N	5.556.751	CACH	C03-21	June 11 2021 in nest
2021	b-D\|P	5.556.752	CACH	C03-21	June 11 2021 in nest
2021	b-D\|S	5.556.753	CACH	D08-21	June 11 2021 in nest
2021	b-D\|T	5.556.754	CACH	D08-21	May 14 2021 ringed in nest
2021	b-D\|U	5.556.755	CACH	D08-21	June 11 2021 in nest
2021	b-D\|V	5.556.756	CACH	E01-21	June 11 2021 in nest
2021	b-D\|0	5.556.757	CACH	201:U	January 21 2022	Y
2021	b-D\|2	5.556.758	CACH	L06-21	September 11 2021	Y
2021	b-D\|3	5.556.759	CACH	L06-21	July 23 2021	Y
2021	b-D\|4	5.556.760	CACH	L06-21	May 20 2021 ringed in nest
2021	b-D\|9	5.556.761	CACH	KD-21	May 30 2021 in nest
2021	b-D\|+	5.556.762	CACH	KA-21	October 19 2021	Y
2021		5.556.763	ARGENTATUS	KC-21	May 20 2021 ringed in nest
2021	r-B0	5.556.769	CACH & ARG	KJ-21	May 28 2021
2021	r-B2	5.556.771	CACH	201:U	April 01 2022	Y
2021	r-B3	5.556.772	CACH	H01-21	November 05 2021	Y
2021	r-B4	5.556.773	CACH	H01-21	May 28 2021 ringed in nest
2021	r-B5	5.556.774	CACH	H01-21	June 11 2021 in nest
2021	r-B6	5.556.775	CACH	KD-21	May 28 2021 in nest
2021	r-B7	5.556.780	CACH	A01-21	June 11 2021 ringed in nest
2021	r-B8	5.556.781	CACH	A01-21	June 11 2021 ringed in nest
2021	r-BA	5.556.784	CACH	L07-21	June 11 2021 ringed in nest
2021	r-BB	5.556.785	CACH	L07-21	June 25 2021 in nest
2021	r-BC	5.556.793	CACH	Q01-21	August 06 2021	Y
2021	r-BN	5.620.084	ARGENTATUS	unknown	February 03 2022	Y
2021	r-BP		ARGENTATUS	unknown	July 30 2021	Y

Hatching success breeding seasons 2019, 2020 & 2021 at Lelystad.

Ring codes used in breeding season 2019, 2020 and 2021 for pulli at Lelystad. Fledging rate estimated from resightings in the period July 2019 - March 2022.
Note that numbers of resightings may strongly increase when adult birds turn back to the colony (>4CY).

In 2019 we ringed 12 chicks, of which 4 have been reported outside the colony up to March 2022 (this cohort is now 4CY March).
In 2020 we ringed 28 chicks, of which already 14 (=50%) have been reported (this cohort is now 3CY).
In 2021 we ringed 64 chicks, now also including some Herring Gulls, of which already 28 codes (>40%) were reported back. That is within 10 months after ringing.

season	code	metal	species	nest	last observation	fledged
2019	n-F\|B	5548151	CACH	PNED	May 16 2019 ringed in nest		2019 rings:	12
2019	n-F\|C	5548152	CACH	PNED	February 9 2021	Y	2019 proven fledged:	5
2019	n-F\|D	5548153	CACH	A2019	April 01 2022	Y
2019	n-F\|E	5548154	LBBG	A2019	May 16 2019 ringed in nest
2019	n-F\|F	5548155	LBBG	B2019	May 16 2019 ringed in nest
2019	n-F\|G	5548156	CACH	B2019	August 01 2019	Y
2019	n-F\|J	5548157	CACH	PLDP	May 16 2019 ringed in nest
2019	n-F\|K	5548158	CACH	PLDP	May 16 2019 ringed in nest
2019	n-F\|L	5548159	CACH	XLDT	August 09 2020	Y
2019	n-F\|M	5548160	CACH	XLDT	May 16 2019 ringed in nest
2019	n-F\|N	5548161	CACH	F2019	June 21 2021	Y
2019	n-F\|P	5548162	CACH	F2019	May 16 2019 ringed in nest
2020	n-F\|R	5552903	CACH	nest03	May 21 2020 ringed in nest		2020 rings:	28
2020	n-F\|S	5552904	CACH	nest03	March 29 2021	Y	2020 proven fledged:	14
2020	n-F\|T	5552905	CACH	nest03	May 21 2020 ringed in nest
2020	n-F\|U	5552906	CACH	nest29	September 2020, ring in nest	N
2020	n-F\|V	5552907	CACH	nest35	May 21 2020 ringed in nest
2020	n-F\|W	5552908	CACH	nest35	May 21 2020 ringed in nest
2020	n-F\|X	5552909	CACH	Nest02	May 21 2020 ringed in nest
2020	n-F\|Y	5552910	CACH & MICHA ?	Nest01	May 21 2020 ringed in nest
2020	n-F\|Z	5552911	CACH & CACTUS	Nest09	May 21 2020 ringed in nest
2020	n-F\|0	5552912	CACH & CACTUS	Nest09	August 09 2021	Y
2020	n-F\|1	5552913	CACH	PESV	May 21 2020 ringed in nest
2020	n-F\|2	5552914	CACH	Nest21	May 21 2020 ringed in nest
2020	n-F\|4	5552915	CACH	Nest21	October 27 2020	Y
2020	n-F\|5	5552916	CACH	Nest33	September 19 2020	Y
2020	n-F\|6	5552917	CACH	Nest33	July 27 2021	Y
2020	n-F\|7	5552918	CACH	PESV	October 15 2020	Y
2020	n-F\|8	5552919	CACH	Nest11	October 09 2021	Y
2020	n-F\|9	5552920	CACH	Nest11	December 30 2021	Y
2020	n-F\|+	5552921	CACH	Nest14	July 19 2021	Y
2020	n-F\|=	5552922	CACH	Nest14	March 19 2021	Y
2020	b-F\|A	5552923	CACH	Nest25	May 21 2020 ringed in nest
2020	b-F\|B	5552924	CACH	Nest25	May 21 2020 ringed in nest
2020	b-F\|C	5552925	CACH	Nest17	May 21 2020 ringed in nest
2020	b-F\|D	5552926	CACH	Nest32	July 21 2021	Y
2020	b-F\|E	5552927	CACH	Nest31	May 21 2020 ringed in nest
2020	b-F\|F	5552928	CACH	Nest37	May 21 2020 ringed in nest
2020	b-F\|G	5552929	CACH & ARG	Nest38	September 30 2020	Y
2020	b-F\|H	5552930	CACH & ARG	Nest38	October 30 2021	Y
2021	r-F.J	5550681	ARGENTATUS		November 12 2021	Y	2021 rings:	64
2021	r-F.H	5550682	UNCERTAIN	54	June 26 2021 ringed in nest		2021 proven fledged:	28
2021	r-F.K	5550683	ARGENTATUS	38	June 26 2021 ringed in nest
2021	r-F.L	5550684	CACH	14	March 04 2022	Y
2021	r-F.M	5550685	CACH	14	October 16 2021	Y
2021	r-F.N	5550686	CACH	14	June 26 2021 ringed in nest
2021	r-F.P	5550687	ARGENTATUS		June 26 2021 ringed in nest
2021	r-F.R	5550688	ARGENTATUS		February 23 2022	Y
2021	r-F.S	5550689	ARGENTATUS		June 26 2021 ringed in nest
2021	r-F.T	5550690	ARGENTATUS		June 26 2021 ringed in nest
2021	r-F.U	5550691	ARGENTATUS		June 26 2021 ringed in nest
2021	r-F.V	5550692	ARGENTATUS		February 03 2022	Y
2021	r-F.W	5550693	ARGENTATUS		October 29 2021	Y
2021	r-F.X	5550694	ARGENTATUS		October 17 2021	Y
2021	r-F.Y	5550695	CACH	61	June 26 2021 ringed in nest
2021	r-F.Z	5550696	ARGENTATUS		June 26 2021 ringed in nest
2021	r-F.1	5550697	ARGENTATUS		January 2022	Y
2021	r-F.2	5550698	ARGENTATUS		June 26 2021 ringed in nest
2021	r-F.3	5550699	CACH	43	June 26 2021 ringed in nest
2021	r-F.4	5550700	CACH	43	June 26 2021 ringed in nest
2021	b-F\|J	5559376	CACH & ARG	38	August 29 2021	Y
2021	b-F\|K	5559377	CACH & ARG	38	June 26 2021	Y
2021	b-S\|X	5559378	ARG X MICH F2	54	May 28 2021 ringed in nest
2021	b-S\|Y	5559379	LBBG	54	August 30 2021	Y
2021		5559380	UNCERTAIN	54	May 28 2021 ringed in nest
2021	b-F\|L	5559381	CACH	18(2021)	February 23 2022	Y
2021	b-S\|Z	5559382	ARGENTATUS ?	17	May & June 2021 ringed in nest
2021	b-S\|0	5559383	ARGENTATUS ?	17	May & June 2021 ringed in nest
2021	b-S\|1	5559384	ARGENTATUS ?	17	May 28 2021 ringed in nest
2021	b-F\|M	5559385	CACH	15	February 03 2022	y
2021	b-F\|N	5559386	CACH	15	March 13 2022	Y
2021	b-S\|2	5559401	UNKNOWN	42	May 28 2021 ringed in nest
2021	b-F\|P	5559402	CACH	13(2020)	October 30 2021	Y
2021	b-F\|R	5559403	CACH	13(2020)	May 28 2021 ringed in nest
2021	b-F\|S	5559404	CACH	13(2020)	May 28 2021 ringed in nest
2021	b-F\|T	5559405	CACH	44	May 28 2021 ringed in nest
2021	b-F\|U	5559406	CACH	13(2021)	May 28 2021 ringed in nest
2021	b-F\|V	5559407	CACH	58	August 28 2021	y
2021	b-F\|W	5559408	CACH	58	September 04 2021	y
2021	b-F\|X	5559409	CACH	PHSV	November 14 2021	Y
2021	b-F\|Y	5559410	CACH	PHSV	August 29 2021	Y
2021	b-F\|Z	5559411	CACH	PHSV	May 28 2021 ringed in nest
2021	b-F\|0	5559412	CACH	60, 62, 63	May 28 2021 ringed in nest
2021	b-F\|1	5559413	CACH & ARG	60, 62, 63	October 06 2021	Y
2021	b-F\|2	5559414	ARGENTATUS	60, 62, 63	May 28 2021 ringed in nest
2021	b-F\|4	5559415	ARGENTATUS	60, 62, 63	March 12 2022	Y
2021	b-S\|3	5559416	ARGENTATUS ?	60, 62, 63	May 28 2021 ringed in nest
2021	b-S\|4	5559417	ARGENTATUS ?	60, 62, 63	May 28 2021 ringed in nest
2021	b-S\|4	5559417	ARGENTATUS	60, 62, 63	June 26 2021 ringed in nest
2021	b-F\|5	5559418	CACH	PLDP	May 28 2021 ringed in nest
2021		5559419	UNCERTAIN	6	May 28 2021 ringed in nest
2021	b-F\|6	5559420	CACH & ARG	40	May 28 2021 ringed in nest
2021	b-F\|7	5559421	CACH & ARG	40	May 28 2021 ringed in nest
2021	b-F\|8	5559422	CACH & ARG	34	October 30 2021	Y
2021	b-F\|9	5559423	CACH & ARG	34	October 09 2021	Y
2021	b-F\|+	5559424	CACH & ARG	34	January 17 2022	Y
2021	b-F\|=	5559425	CACH	53	December 19 2021	Y
2021	r-F.A	5559426	CACH	53	August 22 2021	Y
2021	r-F.B	5559427	CACH	61	ADULT FEMALE
2021	r-F.D	5559428	CACH	3	January 14 2022	Y
2021	r-F.E	5559429	CACH	3	September 26 2021	Y
2021	r-F.F	5559430	CACH	PNED	May 28 2021 ringed in nest
2021	r-F.G	5559431	CACH	PNED	May 28 2021 ringed in nest
2021	r-F.C	6213012	CACH	43	ADULT MALE

metal rings:		104				46