Totals Castricum aan Zee (zeetrek) 2021

Year
Period
count-field
Also present

	Species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Totals	S	N	Maximum	Presence (%)	Presence (days)	First	Last
1.	Dark-bellied Brent Goose	145	97	3903	866	335	0	0	0	46	791	12	0	6195	811	5384	1530 (9 Mar)	50	70	1 Jan	22 Nov
2.	Pale-bellied Brent Goose	0	0	1	1	0	0	0	0	0	0	0	0	2	0	2	1 (24 Mar)	1	2	24 Mar	9 Apr
3.	Canada Goose	0	14	10	6	0	0	0	0	9	0	0	0	39	21	18	14 (25 Feb)	5	7	25 Feb	14 Sep
4.	Barnacle Goose	0	342	227	993	162	0	0	0	0	0	0	398	2122	25	2097	489 (28 Apr)	14	19	6 Feb	22 Dec
5.	Greylag Goose	0	41	71	58	15	0	0	8	17	2	2	6	220	92	128	29 (19 Mar)	27	37	6 Feb	21 Dec
6.	Anser sp.	0	70	0	0	0	0	0	0	0	0	0	0	70	0	70	70 (21 Feb)	1	1	21 Feb	21 Feb
7.	goose sp.	0	134	0	0	3	0	0	0	0	0	0	0	137	7	130	130 (9 Feb)	2	3	6 Feb	2 May
8.	Pink-footed Goose	0	5	0	0	0	0	0	0	0	0	0	0	5	5	0	5 (13 Feb)	1	1	13 Feb	13 Feb
9.	Eurasian White-fronted Goose	0	832	1	0	0	0	0	0	0	0	0	56	889	298	591	496 (6 Feb)	5	7	6 Feb	22 Dec
10.	Mute Swan	0	0	0	0	17	0	0	0	0	0	0	0	17	4	13	13 (13 May)	1	2	1 May	13 May
11.	Egyptian Goose	3	3	20	75	0	0	0	0	0	0	0	8	109	23	86	27 (20 Apr)	15	21	31 Jan	22 Dec
12.	Shelduck	24	101	83	91	35	22	1526	57	19	3	3	0	1964	60	1904	1043 (17 Jul)	44	61	23 Jan	7 Nov
13.	Garganey	0	0	4	31	0	0	0	0	0	0	0	0	35	0	35	12 (1 Apr)	3	4	19 Mar	28 Apr
14.	Shoveler	6	7	128	303	0	0	0	5	6	0	0	4	459	43	416	124 (28 Apr)	20	28	29 Jan	22 Dec
15.	Gadwall	2	33	30	43	7	0	0	2	1	3	0	2	123	15	108	26 (6 Feb)	17	23	1 Jan	21 Dec
16.	Wigeon	146	2244	1432	356	12	0	0	23	118	153	5	154	4643	512	4131	1656 (6 Feb)	54	75	1 Jan	22 Dec
17.	Mallard	2	4	6	7	0	0	0	1	4	0	0	0	24	7	17	4 (9 Mar)	8	11	10 Jan	29 Sep
18.	Pintail	4	58	113	97	0	0	0	14	16	22	0	0	324	48	276	63 (9 Mar)	23	32	10 Jan	6 Oct
19.	Teal	3	337	436	1111	60	0	13	113	156	53	2	10	2294	420	1874	275 (28 Apr)	54	75	29 Jan	22 Dec
20.	duck sp.	0	59	14	0	0	0	0	0	0	5	0	0	78	55	23	39 (9 Feb)	5	7	6 Feb	14 Oct
21.	Pochard	0	0	1	2	0	0	0	0	20	2	0	0	25	14	11	20 (23 Sep)	3	4	14 Mar	6 Oct
22.	Tufted Duck	0	58	39	19	1	0	1	5	35	10	1	0	169	77	92	57 (6 Feb)	18	25	6 Feb	6 Nov
23.	Scaup	2	3	5	5	0	0	0	2	52	8	0	0	77	32	45	50 (23 Sep)	11	15	1 Jan	21 Oct
24.	Aythya sp.	0	0	0	0	0	0	0	0	5	0	0	0	5	5	0	5 (23 Sep)	1	1	23 Sep	23 Sep
25.	Eider	13	46	240	294	63	0	21	11	65	17	19	8	797	237	560	63 (5 Mar)	60	83	1 Jan	22 Dec
26.	Velvet Scoter	71	28	199	105	10	0	0	0	1	2	2	0	418	256	162	62 (15 Mar)	22	31	1 Jan	7 Nov
27.	Common Scoter	17504	1681	6084	17002	3662	28	463	504	675	1448	468	290	49809	22738	27071	10890 (10 Jan)	97	135	1 Jan	22 Dec
28.	Long-tailed Duck	0	0	0	7	0	0	0	0	0	0	1	0	8	0	8	4 (5 Apr)	4	5	5 Apr	22 Nov
29.	Goldeneye	0	22	13	3	0	0	0	0	0	0	0	0	38	18	20	12 (12 Feb)	5	7	6 Feb	2 Apr
30.	Smew	0	13	0	0	0	0	0	0	0	0	0	0	13	9	4	7 (12 Feb)	2	3	9 Feb	13 Feb
	Species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Totals	S	N	Maximum	Presence (%)	Presence (days)	First	Last
31.	Goosander	0	10	5	0	0	0	0	0	0	0	0	1	16	6	10	4 (21 Feb)	4	6	9 Feb	7 Dec
32.	Red-breasted Merganser	3	20	210	271	48	0	3	0	13	34	15	2	619	77	542	77 (20 Mar)	47	66	1 Jan	21 Dec
33.	Feral Pigeon	0	0	0	0	0	0	1	0	0	0	0	0	1	1	0	1 (31 Jul)	1	1	31 Jul	31 Jul
34.	Red-necked Grebe	0	1	3	0	0	0	0	1	2	0	0	0	7	2	5	2 (20 Mar)	4	5	12 Feb	23 Sep
35.	Great Crested Grebe	27	458	212	26	19	0	20	8	25	35	76	21	927	533	394	155 (6 Feb)	58	80	10 Jan	22 Dec
36.	Black-necked Grebe	0	0	0	0	0	0	1	0	0	0	0	0	1	0	1	1 (19 Jul)	1	1	19 Jul	19 Jul
37.	Black-necked / Slavonian Grebe	0	0	0	0	0	0	0	1	0	0	0	0	1	0	1	1 (28 Aug)	1	1	28 Aug	28 Aug
38.	Oystercatcher	0	50	71	247	71	0	39	137	9	2	0	0	626	232	394	44 (20 Apr)	50	70	6 Feb	6 Oct
39.	Avocet	0	3	91	54	0	0	12	0	5	0	0	0	165	0	165	58 (24 Mar)	11	15	6 Feb	21 Sep
40.	Grey Plover	0	0	17	391	173	0	0	21	2	2	0	0	606	17	589	187 (28 Apr)	25	35	5 Mar	21 Oct
41.	Golden Plover	0	21	4	0	0	0	0	8	2	0	0	0	35	33	2	21 (6 Feb)	5	7	6 Feb	11 Sep
42.	Ringed Plover	0	1	2	15	7	0	4	8	11	0	0	0	48	15	33	14 (28 Apr)	14	20	6 Feb	22 Sep
43.	Little Ringed Plover	0	0	0	0	0	0	0	0	1	0	0	0	1	0	1	1 (5 Sep)	1	1	5 Sep	5 Sep
44.	Lapwing	0	201	4	0	0	0	0	0	0	0	0	0	205	20	185	201 (6 Feb)	1	2	6 Feb	31 Mar
45.	Kentish Plover	0	0	0	1	0	0	0	0	0	0	0	0	1	0	1	1 (15 Apr)	1	1	15 Apr	15 Apr
46.	Whimbrel	0	0	1	474	143	0	43	46	1	0	0	0	708	90	618	344 (28 Apr)	22	31	17 Mar	11 Sep
47.	Curlew	0	24	60	210	11	1	5	31	5	0	0	0	347	48	299	65 (19 Apr)	35	48	6 Feb	29 Sep
48.	Bar-tailed Godwit	0	1	121	3588	475	1	7	18	0	1	0	0	4212	25	4187	968 (21 Apr)	28	39	26 Feb	21 Oct
49.	Black-tailed Godwit	0	0	0	1	0	0	0	0	0	0	0	0	1	0	1	1 (1 Apr)	1	1	1 Apr	1 Apr
50.	Woodcock	0	3	0	0	0	0	0	0	0	0	0	0	3	0	3	3 (6 Feb)	1	1	6 Feb	6 Feb
51.	Snipe	0	0	0	0	0	0	2	0	1	0	0	0	3	1	2	2 (21 Jul)	1	2	21 Jul	9 Sep
52.	Common Sandpiper	0	0	0	1	0	0	0	3	1	0	0	0	5	2	3	2 (21 Aug)	3	4	22 Apr	26 Sep
53.	Wood Sandpiper	0	0	0	0	0	0	2	0	0	0	0	0	2	2	0	1 (3 Jul)	1	2	3 Jul	10 Jul
54.	Redshank	0	0	2	38	0	0	13	41	0	0	0	0	94	5	89	31 (28 Apr)	9	13	5 Mar	31 Aug
55.	Spotted Redshank	0	1	0	0	0	1	0	0	1	0	0	0	3	3	0	1 (6 Feb)	2	3	6 Feb	9 Sep
56.	Greenshank	0	0	0	15	0	0	1	2	0	0	0	0	18	1	17	12 (28 Apr)	5	7	22 Apr	28 Aug
57.	Turnstone	0	3	0	5	21	0	2	37	15	1	0	0	84	29	55	21 (23 May)	15	21	6 Feb	22 Oct
58.	Knot	0	0	133	327	142	0	28	24	24	8	0	0	686	36	650	151 (28 Apr)	22	31	5 Mar	21 Oct
59.	wader sp.	0	2	3	1	162	0	8	38	1	0	5	0	220	41	179	162 (2 May)	6	9	20 Feb	22 Nov
60.	large wader	0	0	0	50	0	0	0	6	0	0	0	0	56	6	50	40 (22 Apr)	4	6	1 Apr	12 Aug
	Species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Totals	S	N	Maximum	Presence (%)	Presence (days)	First	Last
61.	Curlew Sandpiper	0	0	0	1	6	0	1	0	0	0	0	0	8	0	8	6 (2 May)	2	3	28 Apr	18 Jul
62.	Sanderling	9	30	359	791	449	0	84	30	38	31	66	6	1893	145	1748	200 (1 May)	43	60	1 Jan	22 Dec
63.	Dunlin	0	91	1765	1947	296	0	29	35	13	215	0	0	4391	247	4144	1019 (28 Apr)	42	58	6 Feb	22 Oct
64.	Purple Sandpiper	0	0	0	0	0	0	0	1	0	0	0	0	1	0	1	1 (30 Aug)	1	1	30 Aug	30 Aug
65.	Little Stint	0	0	0	1	0	0	0	0	0	0	0	0	1	0	1	1 (28 Apr)	1	1	28 Apr	28 Apr
66.	Calidris sp.	0	6	0	88	24	0	16	24	2	2	1	0	163	25	138	40 (19 Apr)	13	18	26 Feb	7 Nov
67.	Little Tern	0	0	0	345	95	0	7	10	3	1	0	0	461	22	439	78 (20 Apr)	16	22	18 Apr	6 Oct
68.	Gull-billed Tern	0	0	0	0	0	0	1	0	0	0	0	0	1	0	1	1 (22 Jul)	1	1	22 Jul	22 Jul
69.	Caspian Tern	0	0	0	0	0	0	0	2	0	0	0	0	2	2	0	2 (11 Aug)	1	1	11 Aug	11 Aug
70.	Black Tern	0	0	0	110	150	0	26	2113	9	0	0	0	2408	2102	306	1379 (14 Aug)	26	36	18 Apr	29 Sep
71.	White-winged Black Tern	0	0	0	0	0	0	0	6	1	0	0	0	7	7	0	5 (14 Aug)	2	3	14 Aug	1 Sep
72.	Arctic Tern	0	0	0	107	123	1	21	6	16	5	0	0	279	41	238	63 (5 May)	17	24	11 Apr	21 Oct
73.	Common/Arctic Tern	0	0	0	5117	2342	0	1614	17628	7755	110	0	0	34566	23373	11193	4093 (14 Aug)	44	61	7 Apr	22 Oct
74.	Common Tern	0	0	8	1524	1714	76	1484	432	702	16	0	0	5956	2739	3217	480 (14 Sep)	38	53	27 Mar	6 Oct
75.	Sandwich Tern	0	0	188	4161	3617	271	3445	7727	7703	739	0	0	27851	17350	10501	1574 (2 May)	71	98	17 Mar	31 Oct
76.	Little Gull	1	0	1660	22103	17513	0	3	16	61	25	3	7	41392	1382	40010	12107 (1 May)	51	71	22 Jan	15 Dec
77.	Kittiwake	521	1	3	246	4	0	0	8	5	131	700	439	2058	1495	563	576 (7 Nov)	29	41	1 Jan	21 Dec
78.	Black-headed Gull	111	515	598	1355	531	68	6274	13638	840	1651	129	45	25755	19635	6120	2853 (14 Aug)	88	122	1 Jan	22 Dec
79.	Mediterranean Gull	0	0	2	11	2	2	65	148	2	2	0	0	234	183	51	58 (14 Aug)	27	37	9 Mar	6 Oct
80.	Common Gull	552	661	1412	6001	3188	38	1257	1127	1148	1071	543	356	17354	4852	12502	2440 (1 May)	91	126	1 Jan	22 Dec
81.	Caspian Gull	0	0	2	1	0	0	0	0	2	2	2	0	9	7	2	2 (31 Oct)	5	7	19 Mar	7 Nov
82.	L. argentatus x L. hyperboreus	0	0	0	1	0	0	0	0	0	0	0	0	1	1	0	1 (9 Apr)	1	1	9 Apr	9 Apr
83.	Yellow-legged Gull	0	0	0	0	0	0	2	3	1	0	0	0	6	4	2	1 (17 Jul)	4	6	17 Jul	5 Sep
84.	Great Black-backed Gull	0	1	5	0	0	1	3	8	11	0	0	3	32	13	19	4 (21 Aug)	12	16	28 Feb	21 Dec
85.	Lesser Black-backed Gull	4	100	5	0	0	0	0	0	0	131	2	0	242	193	49	121 (31 Oct)	9	13	1 Jan	21 Nov
86.	Iceland Gull	0	0	0	0	0	0	0	0	1	0	0	0	1	1	0	1 (29 Sep)	1	1	29 Sep	29 Sep
87.	Long-tailed Skua	0	0	0	0	0	0	0	3	0	0	0	0	3	1	2	1 (16 Aug)	2	3	16 Aug	30 Aug
88.	skua sp.	0	0	0	0	0	0	0	11	14	3	3	0	31	17	14	4 (16 Aug)	11	15	16 Aug	7 Nov
89.	Arctic Skua	0	0	11	27	10	0	2	60	255	32	3	0	400	179	221	47 (1 Sep)	37	51	22 Mar	13 Nov
90.	S. parasiticus / pomarinus	0	0	0	0	0	0	0	0	0	1	0	0	1	0	1	1 (22 Oct)	1	1	22 Oct	22 Oct
	Species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Totals	S	N	Maximum	Presence (%)	Presence (days)	First	Last
91.	Pomarine Skua	0	0	0	0	0	0	0	4	2	1	3	0	10	9	1	3 (16 Aug)	4	6	13 Aug	7 Nov
92.	Great Skua	0	0	0	2	0	0	1	16	6	3	3	2	33	13	20	15 (16 Aug)	7	10	9 Apr	1 Dec
93.	Puffin	0	0	0	1	0	0	0	0	0	1	0	0	2	0	2	1 (2 Apr)	1	2	2 Apr	6 Oct
94.	Razorbill	0	2	5	1	0	0	0	0	6	2	3	0	19	10	9	2 (14 Mar)	11	15	6 Feb	6 Nov
95.	Razorbill/Guillemot	175	428	160	200	0	0	1	8	625	746	848	503	3694	1259	2435	456 (24 Nov)	53	73	1 Jan	22 Dec
96.	Little Auk	0	0	0	0	0	0	0	0	0	3	0	0	3	1	2	2 (22 Oct)	1	2	6 Oct	22 Oct
97.	Guillemot	2	11	9	5	1	0	0	5	148	38	10	8	237	103	134	51 (23 Sep)	33	46	24 Jan	22 Dec
98.	Red-throated Diver	11	67	166	122	27	0	0	0	180	49	29	323	974	330	644	174 (15 Dec)	60	83	1 Jan	22 Dec
99.	Black-throated Diver	2	3	6	40	0	0	0	0	1	0	0	0	52	2	50	32 (7 Apr)	12	17	29 Jan	23 Sep
100.	Great Northern Diver	0	1	0	0	0	0	0	0	0	0	0	0	1	1	0	1 (9 Feb)	1	1	9 Feb	9 Feb
101.	diver sp.	645	2563	1581	456	51	0	0	1	40	263	1113	562	7275	3336	3939	1971 (9 Feb)	63	87	1 Jan	22 Dec
102.	Great Northern/Yellow-billed Diver	0	0	1	0	0	0	0	0	0	0	0	0	1	0	1	1 (25 Mar)	1	1	25 Mar	25 Mar
103.	Leach's Petrel	0	0	0	0	0	0	0	0	1	4	0	0	5	3	2	4 (22 Oct)	1	2	29 Sep	22 Oct
104.	Fulmar	0	0	0	47	2	0	0	0	4	0	0	3	56	5	51	43 (7 Apr)	8	11	7 Apr	1 Dec
105.	Sooty Shearwater	0	0	0	0	0	0	0	0	20	1	2	2	25	21	4	18 (23 Sep)	5	7	11 Sep	1 Dec
106.	Manx Shearwater	0	0	0	0	0	0	0	0	0	1	0	0	1	0	1	1 (22 Oct)	1	1	22 Oct	22 Oct
107.	Gannet	119	34	133	378	90	4	60	125	679	127	175	81	2005	986	1019	265 (29 Sep)	81	112	1 Jan	22 Dec
108.	Cormorant	639	9360	245	0	0	0	0	0	0	0	0	102	10346	5677	4669	2981 (12 Feb)	7	10	10 Jan	22 Dec
109.	Spoonbill	0	0	0	42	0	0	0	0	42	243	0	0	327	285	42	243 (2 Oct)	4	6	1 Apr	2 Oct
110.	Great White Egret	0	0	0	0	0	0	0	0	1	3	0	0	4	4	0	3 (31 Oct)	1	2	21 Sep	31 Oct
111.	Grey Heron	0	0	0	3	0	0	1	1	7	0	0	0	12	8	4	5 (30 Sep)	4	6	14 Apr	30 Sep
112.	Sparrowhawk	0	0	0	1	0	0	0	0	1	0	0	0	2	1	1	1 (10 Apr)	1	2	10 Apr	9 Sep
113.	Marsh Harrier	0	0	1	0	0	0	0	0	1	0	0	0	2	1	1	1 (25 Mar)	1	2	25 Mar	5 Sep
114.	Hen Harrier	0	0	0	0	0	0	0	0	0	1	0	0	1	1	0	1 (31 Oct)	1	1	31 Oct	31 Oct
115.	Peregrine	0	1	0	0	1	0	0	0	1	0	0	0	3	1	2	1 (19 Feb)	2	3	19 Feb	23 Sep
116.	Rook	0	0	2	0	1	0	0	0	0	0	0	0	3	1	2	1 (24 Mar)	2	3	24 Mar	1 May
117.	Skylark	0	9	1	0	0	0	0	0	0	3	0	0	13	7	6	7 (9 Feb)	3	4	9 Feb	13 Oct
118.	Starling	0	0	468	0	0	0	0	0	0	0	0	0	468	0	468	450 (17 Mar)	3	4	14 Mar	31 Mar
119.	Blue-headed Wagtail	0	0	0	3	2	0	0	0	0	0	0	0	5	2	3	3 (19 Apr)	1	2	19 Apr	2 May
120.	Yellow wagtail sp.	0	0	1	0	0	0	0	0	0	0	0	0	1	0	1	1 (31 Mar)	1	1	31 Mar	31 Mar
	Species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Totals	S	N	Maximum	Presence (%)	Presence (days)	First	Last
121.	Grey Wagtail	0	0	1	0	0	0	0	0	0	0	0	0	1	0	1	1 (5 Mar)	1	1	5 Mar	5 Mar
122.	White Wagtail	0	0	0	9	0	0	0	0	0	0	1	0	10	1	9	6 (19 Apr)	2	3	3 Apr	22 Nov
123.	alba wagtail sp.	0	0	12	2	2	0	0	0	0	0	0	0	16	8	8	12 (31 Mar)	2	3	31 Mar	2 May
124.	Tree Pipit	0	0	1	0	0	0	0	0	0	0	0	0	1	0	1	1 (31 Mar)	1	1	31 Mar	31 Mar
125.	Rock Pipit	0	0	2	0	0	0	0	0	0	2	0	0	4	2	2	2 (6 Oct)	2	3	24 Mar	6 Oct
126.	Snow Bunting	0	2	0	0	0	0	0	0	0	0	4	0	6	2	4	3 (22 Nov)	2	3	6 Feb	22 Nov
	Other species
	Species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Totals	S	N	Maximum	Presence (%)	Presence (days)	First	Last
1.	Harbour Porpoise	20	36	86	19	0	0	16	2	30	7	6	5	227	95	132	32 (9 Mar)	37	51	1 Jan	22 Dec
2.	Grey seal	0	1	1	1	1	0	1	0	0	0	0	0	5	0	5	1 (6 Feb)	4	5	6 Feb	10 Jul
3.	Common Seal	0	0	3	5	1	0	4	0	1	0	0	0	14	6	8	2 (5 Mar)	9	12	5 Mar	13 Sep
	Other species
	Species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Totals	S	N	Maximum	Presence (%)	Presence (days)	First	Last
1.	white sp. (butterfly)	0	0	0	0	0	0	0	0	1	0	0	0	1	1	0	1 (14 Sep)	1	1	14 Sep	14 Sep
	Species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Totals	S	N	Maximum	Presence (%)	Presence (days)	First	Last
	Totals	20766	20954	22902	72464	35897	514	16633	44373	21743	8268	4260	3407	272181	113255	158926		100	139
	Observation hours	11:15	16:35	41:25	66:35	24:00	1:00	25:30	43:40	46:15	25:30	12:30	10:15	324:30

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Totals Castricum aan Zee (zeetrek) 2021