Also present

Totals Castricum aan Zee (zeetrek) 2017

	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	69	1019	2067	245	74	0	0	0	61	1043	7	35	4620	396	4224	1063 (18 Mar)	40	58	3 Jan	26 Dec
2.	Pale-bellied Brent Goose	0	0	2	0	0	0	0	0	0	0	0	0	2	0	2	2 (13 Mar)	1	1	13 Mar	13 Mar
3.	Canada Goose	0	0	25	4	4	0	0	0	0	0	0	0	33	13	20	8 (12 Mar)	5	7	11 Mar	11 May
4.	Barnacle Goose	103	0	111	634	285	0	0	0	0	0	0	0	1133	4	1129	474 ( 9 Apr)	10	14	6 Jan	12 May
5.	Greylag Goose	0	5	145	33	7	0	4	35	1	1	0	0	231	90	141	37 ( 3 Mar)	18	26	17 Feb	12 Oct
6.	goose sp.	0	0	0	0	0	0	0	20	0	500	0	0	520	520	0	500 (27 Oct)	1	2	6 Aug	27 Oct
7.	Domestic Goose	0	0	0	0	0	0	7	0	0	0	0	0	7	7	0	7 ( 7 Jul)	1	1	7 Jul	7 Jul
8.	Pink-footed Goose	0	0	0	0	0	0	0	0	0	0	0	4	4	4	0	4 (16 Dec)	1	1	16 Dec	16 Dec
9.	Eurasian White-fronted Goose	0	0	42	0	0	0	0	0	0	0	0	0	42	0	42	42 (11 Mar)	1	1	11 Mar	11 Mar
10.	Mute Swan	0	0	0	0	20	0	0	0	0	0	0	0	20	6	14	16 (11 May)	1	2	11 May	26 May
11.	swan sp.	0	0	0	0	0	0	0	0	0	3	0	0	3	0	3	3 (27 Oct)	1	1	27 Oct	27 Oct
12.	Egyptian Goose	7	0	21	42	4	0	0	0	10	4	7	0	95	43	52	32 ( 1 Apr)	11	16	6 Jan	9 Nov
13.	Shelduck	14	3	48	112	68	20	482	47	58	337	0	1	1190	435	755	326 (29 Oct)	47	68	4 Jan	28 Dec
14.	Garganey	0	0	21	7	2	0	0	0	0	0	0	0	30	2	28	10 (12 Mar)	6	9	10 Mar	11 May
15.	Shoveler	0	0	738	289	28	0	2	2	14	1	0	3	1077	103	974	496 (12 Mar)	23	33	4 Mar	3 Dec
16.	Gadwall	2	0	85	44	5	0	5	0	9	0	2	0	152	26	126	37 (11 Mar)	17	25	28 Jan	17 Nov
17.	Wigeon	62	82	3513	1014	0	0	0	5	97	128	97	146	5144	261	4883	2973 (13 Mar)	38	55	3 Jan	28 Dec
18.	Mallard	1	0	15	2	6	0	6	2	0	0	2	0	34	15	19	11 (13 Mar)	10	15	3 Jan	9 Nov
19.	Pintail	0	27	809	6	1	0	0	0	1	11	0	0	855	2	853	612 (11 Mar)	10	14	17 Feb	3 Oct
20.	Teal	0	25	1861	1106	4	0	3	6	75	33	26	0	3139	146	2993	847 (13 Mar)	41	60	17 Feb	30 Nov
21.	duck sp.	0	0	0	7	0	0	0	0	0	0	0	0	7	0	7	7 ( 3 Apr)	1	1	3 Apr	3 Apr
22.	Red-crested Pochard	0	0	0	0	0	0	0	0	1	0	0	0	1	0	1	1 ( 9 Sep)	1	1	9 Sep	9 Sep
23.	Pochard	0	0	18	0	0	0	2	0	0	0	0	0	20	0	20	18 (11 Mar)	2	3	11 Mar	19 Jul
24.	Tufted Duck	0	0	12	41	1	0	8	0	3	1	0	0	66	11	55	29 (17 Apr)	12	18	10 Mar	30 Oct
25.	Scaup	3	0	19	6	10	0	13	0	0	25	1	0	77	5	72	19 (11 Mar)	8	12	21 Jan	30 Nov
26.	Eider	18	34	279	105	4	0	0	0	16	83	19	35	593	150	443	59 (10 Mar)	44	64	3 Jan	28 Dec
27.	Velvet Scoter	20	5	31	154	0	0	0	0	0	2	4	5	221	8	213	47 (23 Apr)	19	28	3 Jan	16 Dec
28.	Common Scoter	477	709	3878	7608	1251	45	2653	848	2359	3197	1446	264	24735	3520	21215	1062 ( 8 Apr)	95	138	3 Jan	28 Dec
29.	Long-tailed Duck	3	0	1	2	0	0	0	0	0	3	2	0	11	3	8	2 (28 Jan)	5	8	4 Jan	17 Nov
30.	Goldeneye	4	0	0	12	0	0	0	0	0	7	0	0	23	4	19	12 ( 1 Apr)	5	7	6 Jan	31 Oct
	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	2	2	0	0	0	0	0	0	0	0	0	4	1	3	1 (24 Feb)	3	4	24 Feb	25 Mar
32.	Red-breasted Merganser	25	8	157	178	8	0	3	0	15	24	7	3	428	42	386	45 ( 8 Apr)	42	62	3 Jan	28 Dec
33.	Swift	0	0	0	0	4	0	64	0	0	0	0	0	68	61	7	42 (29 Jul)	3	5	6 May	29 Jul
34.	Feral Pigeon	0	0	0	1	13	0	4	23	2	0	0	0	43	30	13	15 (20 Aug)	5	8	30 Apr	15 Sep
35.	Red-necked Grebe	0	0	1	0	0	0	0	0	0	2	1	0	4	2	2	1 ( 1 Mar)	3	4	1 Mar	3 Nov
36.	Great Crested Grebe	185	66	136	8	4	0	5	3	6	24	17	11	465	291	174	85 (28 Jan)	38	55	3 Jan	28 Dec
37.	Slavonian Grebe	0	0	2	0	0	0	0	0	0	0	0	0	2	0	2	2 (12 Mar)	1	1	12 Mar	12 Mar
38.	Black-necked Grebe	0	0	0	0	0	0	0	0	0	0	0	1	1	0	1	1 ( 3 Dec)	1	1	3 Dec	3 Dec
39.	Oystercatcher	0	17	78	152	116	2	41	25	7	7	2	6	453	204	249	41 (11 May)	45	66	17 Feb	28 Dec
40.	Avocet	0	0	29	28	0	0	10	0	6	0	0	0	73	0	73	17 (28 Mar)	7	10	11 Mar	15 Sep
41.	Grey Plover	0	0	4	264	133	0	1	5	3	6	2	0	418	17	401	127 (17 Apr)	21	30	24 Mar	22 Nov
42.	Golden Plover	0	0	0	0	0	0	2	0	82	3	0	0	87	73	14	57 (10 Sep)	5	7	19 Jul	29 Oct
43.	Ringed Plover	0	0	0	42	130	0	3	6	55	1	0	0	237	57	180	83 (11 May)	16	23	5 Apr	8 Oct
44.	Little Ringed Plover	0	0	0	0	0	0	1	0	0	0	0	0	1	1	0	1 (19 Jul)	1	1	19 Jul	19 Jul
45.	Lapwing	0	0	0	3	0	0	0	0	0	0	0	0	3	1	2	2 (16 Apr)	1	2	16 Apr	30 Apr
46.	Kentish Plover	0	0	0	0	0	0	0	1	0	0	0	0	1	0	1	1 ( 6 Aug)	1	1	6 Aug	6 Aug
47.	Whimbrel	0	0	1	318	39	0	34	7	1	0	0	0	400	41	359	142 (17 Apr)	19	28	13 Mar	11 Sep
48.	Curlew	0	0	22	75	4	0	15	0	0	4	0	0	120	14	106	47 (14 Apr)	17	25	3 Mar	29 Oct
49.	Bar-tailed Godwit	0	0	2	1960	46	0	2	15	45	40	0	0	2110	101	2009	632 (22 Apr)	19	28	13 Mar	12 Oct
50.	Black-tailed Godwit	0	0	0	1	0	0	0	0	0	0	0	0	1	0	1	1 (29 Apr)	1	1	29 Apr	29 Apr
51.	Woodcock	0	0	0	0	0	0	0	0	0	0	0	1	1	1	0	1 ( 9 Dec)	1	1	9 Dec	9 Dec
52.	Snipe	0	0	4	0	0	0	0	0	1	0	0	0	5	5	0	4 ( 1 Mar)	1	2	1 Mar	1 Sep
53.	Grey Phalarope	0	0	0	0	0	0	0	0	0	0	1	0	1	1	0	1 (14 Nov)	1	1	14 Nov	14 Nov
54.	Green Sandpiper	0	0	0	1	0	0	1	0	2	0	0	0	4	4	0	2 (10 Sep)	2	3	30 Apr	10 Sep
55.	Wood Sandpiper	0	0	0	0	1	0	0	0	0	0	0	0	1	0	1	1 ( 6 May)	1	1	6 May	6 May
56.	Redshank	0	0	4	12	2	0	3	41	0	0	0	0	62	2	60	40 (31 Aug)	9	13	11 Mar	31 Aug
57.	Spotted Redshank	0	0	0	0	0	0	0	0	1	0	0	0	1	1	0	1 (17 Sep)	1	1	17 Sep	17 Sep
58.	Greenshank	0	0	0	4	9	0	1	0	1	0	0	0	15	2	13	6 ( 6 May)	5	8	19 Apr	21 Sep
59.	Turnstone	0	2	2	8	18	0	2	0	2	0	1	1	36	2	34	9 ( 6 May)	8	12	17 Feb	16 Dec
60.	Knot	0	0	21	137	161	0	1	13	25	2	0	0	360	41	319	85 ( 6 May)	16	23	9 Mar	12 Oct
	Species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Totals	S	N	Maximum	Presence (%)	Presence (days)	First	Last
61.	Ruff	0	0	16	0	12	0	0	0	5	0	0	0	33	5	28	15 (13 Mar)	3	4	13 Mar	14 Sep
62.	wader sp.	0	0	0	605	0	0	0	1	29	0	0	0	635	19	616	213 (17 Apr)	6	9	17 Apr	15 Sep
63.	Curlew Sandpiper	0	0	0	5	1	0	0	11	0	0	0	0	17	11	6	11 ( 4 Aug)	2	3	30 Apr	4 Aug
64.	Sanderling	458	61	616	511	833	0	65	61	76	26	14	20	2741	156	2585	422 (13 Jan)	46	67	3 Jan	9 Dec
65.	Dunlin	0	114	1107	449	178	0	87	6	87	71	33	0	2132	128	2004	353 (10 Mar)	40	58	24 Feb	30 Nov
66.	Purple Sandpiper	0	0	0	0	0	0	0	0	0	2	2	1	5	2	3	2 (30 Oct)	2	3	30 Oct	16 Dec
67.	Little Stint	0	0	0	7	0	0	0	0	0	1	0	0	8	0	8	5 (29 Apr)	3	4	17 Apr	27 Oct
68.	Calidris sp.	0	0	9	205	371	0	19	0	19	1	0	0	624	34	590	226 (11 May)	8	12	28 Mar	3 Oct
69.	Little Tern	0	0	0	130	23	0	10	20	1	0	0	0	184	24	160	85 (26 Apr)	13	19	17 Apr	23 Sep
70.	Caspian Tern	0	0	0	0	0	0	2	0	0	0	0	0	2	2	0	1 ( 8 Jul)	1	2	8 Jul	22 Jul
71.	Black Tern	0	0	0	151	152	0	1	3	14	0	0	0	321	14	307	86 ( 1 May)	13	19	1 Apr	21 Sep
72.	Arctic Tern	0	0	0	66	118	0	0	7	8	0	0	0	199	15	184	77 ( 1 May)	10	15	15 Apr	15 Sep
73.	Common/Arctic Tern	0	0	0	2823	1686	0	209	203	343	8	0	0	5272	1370	3902	1203 (30 Apr)	32	46	4 Apr	12 Oct
74.	Common Tern	0	0	18	1440	786	62	500	229	65	0	0	0	3100	1162	1938	347 (23 Apr)	43	63	13 Mar	23 Sep
75.	Sandwich Tern	0	0	9	759	712	159	5694	1422	3004	81	0	0	11840	7811	4029	1502 ( 8 Jul)	58	84	13 Mar	12 Oct
76.	Little Gull	2	6	257	14447	1084	0	0	2	29	456	442	2	16727	3006	13721	5573 (15 Apr)	34	50	13 Jan	16 Dec
77.	Kittiwake	2715	0	0	0	0	0	1	1	1	217	528	774	4237	1580	2657	2050 ( 4 Jan)	25	37	3 Jan	28 Dec
78.	Sabine's Gull	0	0	0	0	0	0	0	0	0	3	0	0	3	0	3	2 (28 Oct)	1	2	27 Oct	28 Oct
79.	Black-headed Gull	92	85	1031	613	637	0	5506	441	2108	2127	431	87	13158	10356	2802	2682 (22 Jul)	87	127	3 Jan	28 Dec
80.	Mediterranean Gull	0	0	5	5	1	0	22	6	5	0	0	0	44	31	13	12 (22 Jul)	14	21	5 Mar	21 Sep
81.	Common Gull	514	455	1890	2374	736	0	223	34	394	1271	427	547	8865	3280	5585	585 (14 Mar)	88	129	3 Jan	28 Dec
82.	Caspian Gull	0	0	1	1	0	0	0	0	1	0	0	0	3	1	2	1 ( 4 Mar)	2	3	4 Mar	19 Sep
83.	Herring Gull	0	0	1	0	0	0	0	0	0	0	0	0	1	1	0	1 (31 Mar)	1	1	31 Mar	31 Mar
84.	Yellow-legged Gull	0	0	0	0	1	0	0	1	1	0	0	0	3	2	1	1 (27 May)	2	3	27 May	20 Sep
85.	Great Black-backed Gull	17	13	41	145	5	0	0	0	202	14	0	0	437	153	284	114 (11 Sep)	20	29	3 Jan	28 Oct
86.	Lesser Black-backed Gull	0	78	79	0	0	0	0	0	7	0	0	0	164	65	99	52 (24 Feb)	5	8	17 Feb	13 Sep
87.	Iceland Gull	0	0	0	1	1	0	0	0	0	0	0	0	2	1	1	1 (30 Apr)	1	2	30 Apr	1 May
88.	Long-tailed Skua	0	0	0	0	0	0	0	0	3	0	0	0	3	1	2	2 (13 Sep)	1	2	13 Sep	20 Sep
89.	skua sp.	0	0	0	0	0	0	0	0	19	3	0	0	22	7	15	12 (13 Sep)	5	8	10 Sep	12 Oct
90.	Arctic Skua	0	0	0	3	2	0	0	3	52	18	0	0	78	35	43	20 (13 Sep)	15	22	15 Apr	29 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	2	0	0	0	0	0	0	0	11	3	0	0	16	5	11	6 (13 Sep)	6	9	3 Jan	5 Oct
92.	Great Skua	2	1	0	0	0	0	0	0	30	12	1	2	48	22	26	10 (13 Sep)	13	19	3 Jan	28 Dec
93.	Puffin	0	0	0	0	0	0	0	0	0	0	0	1	1	0	1	1 ( 9 Dec)	1	1	9 Dec	9 Dec
94.	Razorbill	9	1	2	0	0	0	0	0	2	11	3	0	28	11	17	5 (29 Oct)	10	15	4 Jan	14 Nov
95.	Razorbill/Guillemot	414	481	57	2	0	0	0	0	31	454	446	124	2009	1151	858	264 (24 Feb)	45	65	3 Jan	28 Dec
96.	Little Auk	0	0	0	0	0	0	0	0	0	1	1	0	2	0	2	1 (28 Oct)	1	2	28 Oct	25 Nov
97.	Guillemot	45	128	16	2	0	0	0	0	1	12	15	13	232	124	108	122 (24 Feb)	21	31	3 Jan	28 Dec
98.	Red-throated Diver	70	27	86	35	1	0	0	0	17	19	110	45	410	225	185	40 (28 Dec)	44	64	3 Jan	28 Dec
99.	Black-throated Diver	3	0	1	18	0	0	1	0	0	3	1	0	27	1	26	12 ( 8 Apr)	10	14	6 Jan	3 Nov
100.	Great Northern Diver	0	0	1	0	0	0	0	0	0	1	0	0	2	1	1	1 (11 Mar)	1	2	11 Mar	30 Oct
101.	diver sp.	537	285	177	83	1	0	0	0	20	82	1458	398	3041	2308	733	1066 (29 Nov)	57	83	3 Jan	28 Dec
102.	Storm Petrel	0	0	0	0	0	0	0	0	0	2	0	0	2	2	0	1 (13 Oct)	1	2	13 Oct	28 Oct
103.	storm-petrel sp.	0	0	0	0	0	0	0	0	0	0	1	0	1	1	0	1 (18 Nov)	1	1	18 Nov	18 Nov
104.	Leach's Petrel	0	0	0	0	0	0	0	0	2	3	0	0	5	2	3	2 (13 Sep)	3	4	13 Sep	30 Oct
105.	Fulmar	2	0	0	1	0	0	0	1	3	1	1	2	11	3	8	2 (20 Sep)	7	10	3 Jan	28 Dec
106.	Sooty Shearwater	0	0	0	0	0	0	0	0	7	2	0	0	9	4	5	6 (13 Sep)	2	3	11 Sep	4 Oct
107.	Manx Shearwater	0	0	0	0	0	0	0	0	5	0	0	0	5	0	5	2 (13 Sep)	3	4	6 Sep	14 Sep
108.	Gannet	22	2	31	15	43	3	217	105	180	210	55	56	939	321	618	106 ( 4 Oct)	65	95	3 Jan	28 Dec
109.	Cormorant	0	401	0	0	0	0	0	0	49	0	0	0	450	78	372	401 (19 Feb)	1	2	19 Feb	17 Sep
110.	Spoonbill	0	0	0	9	0	0	0	4	75	0	0	0	88	79	9	75 (17 Sep)	2	3	30 Apr	17 Sep
111.	Little Egret	0	0	0	0	0	0	2	0	0	0	0	0	2	0	2	2 ( 8 Jul)	1	1	8 Jul	8 Jul
112.	Great White Egret	0	0	0	1	0	0	0	0	0	0	0	0	1	0	1	1 (22 Apr)	1	1	22 Apr	22 Apr
113.	Grey Heron	0	0	0	0	0	0	4	1	1	0	0	0	6	5	1	2 ( 7 Jul)	3	4	7 Jul	17 Sep
114.	Osprey	0	0	0	2	0	0	0	0	0	0	0	0	2	0	2	1 (22 Apr)	1	2	22 Apr	30 Apr
115.	Sparrowhawk	0	0	0	0	0	0	0	0	1	1	0	0	2	2	0	1 (17 Sep)	1	2	17 Sep	30 Oct
116.	Hen Harrier	0	0	0	0	0	0	0	0	0	0	1	0	1	1	0	1 (25 Nov)	1	1	25 Nov	25 Nov
117.	Common Buzzard	0	0	0	1	0	0	0	0	0	0	0	0	1	0	1	1 (22 Apr)	1	1	22 Apr	22 Apr
118.	Short-eared Owl	0	0	0	0	0	0	0	0	0	0	1	0	1	0	1	1 (29 Nov)	1	1	29 Nov	29 Nov
119.	Kestrel	0	0	0	0	0	0	1	0	6	0	0	0	7	7	0	2 (15 Sep)	3	5	29 Jul	17 Sep
120.	Merlin	0	0	0	2	1	0	0	0	0	2	0	0	5	1	4	2 (17 Apr)	3	4	17 Apr	28 Oct
	Species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Totals	S	N	Maximum	Presence (%)	Presence (days)	First	Last
121.	Hobby	0	0	0	0	0	0	0	0	1	0	0	0	1	1	0	1 (15 Sep)	1	1	15 Sep	15 Sep
122.	Peregrine	0	0	1	0	0	0	0	0	0	0	2	1	4	3	1	2 ( 9 Nov)	2	3	9 Mar	9 Dec
123.	Rose-ringed Parakeet	0	0	0	0	0	0	0	0	0	0	1	0	1	1	0	1 (19 Nov)	1	1	19 Nov	19 Nov
124.	Jackdaw	0	0	6	0	0	0	0	0	0	0	0	0	6	0	6	6 (25 Mar)	1	1	25 Mar	25 Mar
125.	Rook	0	0	0	2	0	0	0	0	0	0	0	0	2	1	1	2 ( 1 Apr)	1	1	1 Apr	1 Apr
126.	Blue Tit	0	0	0	3	0	0	0	0	0	0	0	0	3	3	0	3 ( 1 Apr)	1	1	1 Apr	1 Apr
127.	Skylark	0	0	1	0	0	0	0	0	0	691	3	0	695	695	0	691 ( 9 Oct)	2	3	11 Mar	25 Nov
128.	Shore Lark	0	0	0	0	0	0	0	0	0	0	4	0	4	4	0	4 (17 Nov)	1	1	17 Nov	17 Nov
129.	Sand Martin	0	0	0	0	1	0	6	0	0	0	0	0	7	6	1	3 ( 7 Jul)	2	3	11 May	22 Jul
130.	Swallow	0	0	1	2	38	0	0	0	0	0	0	0	41	6	35	33 (11 May)	3	5	28 Mar	27 May
131.	Starling	0	0	103	0	0	0	0	0	0	0	65	0	168	65	103	90 (13 Mar)	3	5	11 Mar	25 Nov
132.	Yellow wagtail sp.	0	0	0	5	4	0	0	0	0	0	0	0	9	1	8	5 (19 Apr)	2	3	19 Apr	27 May
133.	Grey Wagtail	0	0	0	0	0	0	0	1	1	2	0	0	4	3	1	1 ( 8 Aug)	3	4	8 Aug	23 Oct
134.	alba wagtail sp.	0	0	20	11	1	0	0	0	19	2	0	0	53	33	20	19 (15 Sep)	6	9	4 Mar	9 Oct
135.	Pied Wagtail	0	0	1	0	0	0	0	0	0	0	0	0	1	0	1	1 (25 Mar)	1	1	25 Mar	25 Mar
136.	Meadow Pipit	0	0	2	0	0	0	0	0	0	0	0	0	2	0	2	2 (11 Mar)	1	1	11 Mar	11 Mar
137.	Tree Pipit	0	0	0	0	1	0	0	0	0	0	0	0	1	1	0	1 (21 May)	1	1	21 May	21 May
138.	Rock Pipit	0	0	2	1	0	0	0	0	0	0	0	0	3	1	2	1 (13 Mar)	2	3	13 Mar	7 Apr
139.	Brambling	0	0	1	0	0	0	0	0	0	0	0	0	1	1	0	1 (25 Mar)	1	1	25 Mar	25 Mar
140.	Linnet	0	0	3	0	0	0	0	0	0	0	0	0	3	2	1	3 (25 Mar)	1	1	25 Mar	25 Mar
141.	Mealy Redpoll	0	0	0	0	0	0	0	0	0	0	4	0	4	0	4	4 (29 Nov)	1	1	29 Nov	29 Nov
142.	redpoll sp.	0	0	0	0	0	0	0	0	0	0	2	0	2	2	0	2 (25 Nov)	1	1	25 Nov	25 Nov
143.	Siskin	0	0	0	2	0	0	0	0	0	0	0	0	2	2	0	2 ( 1 Apr)	1	1	1 Apr	1 Apr
144.	Snow Bunting	0	1	0	0	0	0	0	0	0	0	6	0	7	3	4	4 (29 Nov)	3	4	26 Feb	30 Nov
145.	Reed Bunting	0	0	8	0	0	0	0	0	0	0	0	0	8	2	6	6 (11 Mar)	1	2	11 Mar	25 Mar
	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	12	4	8	5	0	0	5	2	3	13	19	11	82	29	53	8 ( 3 Dec)	26	38	3 Jan	16 Dec
2.	Grey seal	0	0	0	0	0	0	1	0	0	0	0	2	3	2	1	1 (13 Jul)	2	3	13 Jul	26 Dec
3.	Common Seal	0	1	0	2	2	0	1	0	3	0	0	2	11	3	8	1 (10 Feb)	8	11	10 Feb	28 Dec
	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	1	0	0	2	0	0	0	0	3	2	1	1 (26 May)	2	3	26 May	27 Aug
	Species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Totals	S	N	Maximum	Presence (%)	Presence (days)	First	Last
	Totals	5909	4148	19814	39609	9895	291	15955	3671	9900	11318	5721	2604	128835	41267	87568		100	146
	Observation hours	11:00	6:40	32:50	45:25	16:26	3:00	31:30	17:00	44:25	42:00	20:37	8:52	279:45

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Totals Castricum aan Zee (zeetrek) 2017