Also present
Totals Castricum aan Zee (zeetrek) 2025
| Species | Jan | Feb | Mar | Apr | May | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 1. | Dark-bellied Brent Goose | 17 | 130 | 1156 | 1069 | 37 | 2409 | 66 | 2343 | 411 ( 4 Apr) | 61 | 30 | 2 Jan | 3 May | ||||
| 2. | Pale-bellied Brent Goose | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 1 ( 5 Apr) | 2 | 1 | 5 Apr | 5 Apr | ||||
| 3. | Canada Goose | 0 | 2 | 19 | 21 | 1 | 43 | 19 | 24 | 13 (30 Apr) | 22 | 11 | 26 Feb | 5 May | ||||
| 4. | Barnacle Goose | 187 | 103 | 3491 | 1465 | 514 | 5760 | 565 | 5195 | 1475 ( 8 Mar) | 43 | 21 | 22 Jan | 3 May | ||||
| 5. | Greylag Goose | 3 | 57 | 254 | 201 | 29 | 544 | 176 | 368 | 91 ( 9 Mar) | 69 | 34 | 22 Jan | 7 May | ||||
| 6. | Pink-footed Goose | 134 | 263 | 0 | 0 | 0 | 397 | 36 | 361 | 263 (26 Feb) | 6 | 3 | 22 Jan | 26 Feb | ||||
| 7. | Eurasian White-fronted Goose | 5 | 46 | 0 | 0 | 0 | 51 | 1 | 50 | 46 (26 Feb) | 6 | 3 | 22 Jan | 26 Feb | ||||
| 8. | Mute Swan | 0 | 0 | 0 | 0 | 10 | 10 | 6 | 4 | 7 ( 5 May) | 4 | 2 | 5 May | 7 May | ||||
| 9. | Egyptian Goose | 2 | 14 | 70 | 94 | 16 | 196 | 49 | 147 | 28 (21 Mar) | 53 | 26 | 22 Jan | 5 May | ||||
| 10. | Shelduck | 7 | 10 | 129 | 145 | 73 | 364 | 33 | 331 | 59 (19 Mar) | 76 | 37 | 2 Jan | 8 May | ||||
| 11. | Garganey | 0 | 0 | 13 | 5 | 0 | 18 | 2 | 16 | 8 (21 Mar) | 10 | 5 | 21 Mar | 26 Apr | ||||
| 12. | Shoveler | 0 | 2 | 724 | 1083 | 0 | 1809 | 101 | 1708 | 357 ( 4 Apr) | 49 | 24 | 18 Feb | 30 Apr | ||||
| 13. | Gadwall | 0 | 14 | 28 | 32 | 1 | 75 | 18 | 57 | 16 ( 6 Apr) | 35 | 17 | 15 Feb | 3 May | ||||
| 14. | Wigeon | 355 | 386 | 1591 | 72 | 2 | 2406 | 385 | 2021 | 913 (29 Mar) | 61 | 30 | 2 Jan | 3 May | ||||
| 15. | Mallard | 0 | 0 | 3 | 1 | 0 | 4 | 0 | 4 | 2 (20 Mar) | 6 | 3 | 8 Mar | 4 Apr | ||||
| 16. | Pintail | 1 | 11 | 120 | 30 | 1 | 163 | 3 | 160 | 39 ( 8 Mar) | 33 | 16 | 22 Jan | 7 May | ||||
| 17. | Teal | 21 | 52 | 2314 | 939 | 21 | 3347 | 100 | 3247 | 683 ( 8 Mar) | 71 | 35 | 2 Jan | 7 May | ||||
| 18. | duck sp. | 0 | 0 | 10 | 0 | 0 | 10 | 0 | 10 | 10 ( 8 Mar) | 2 | 1 | 8 Mar | 8 Mar | ||||
| 19. | Pochard | 0 | 0 | 0 | 5 | 0 | 5 | 0 | 5 | 3 ( 3 Apr) | 4 | 2 | 3 Apr | 30 Apr | ||||
| 20. | Tufted Duck | 2 | 0 | 7 | 21 | 0 | 30 | 2 | 28 | 15 (30 Apr) | 16 | 8 | 22 Jan | 30 Apr | ||||
| 21. | Scaup | 0 | 2 | 11 | 0 | 0 | 13 | 0 | 13 | 6 ( 9 Mar) | 6 | 3 | 18 Feb | 30 Mar | ||||
| 22. | Aythya sp. | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 (26 Jan) | 2 | 1 | 26 Jan | 26 Jan | ||||
| 23. | Eider | 14 | 52 | 369 | 197 | 36 | 668 | 327 | 341 | 90 (26 Mar) | 92 | 45 | 2 Jan | 7 May | ||||
| 24. | Velvet Scoter | 28 | 0 | 13 | 3 | 0 | 44 | 28 | 16 | 27 ( 2 Jan) | 12 | 6 | 2 Jan | 4 Apr | ||||
| 25. | Common Scoter | 393 | 351 | 4638 | 2875 | 2117 | 10374 | 2774 | 7600 | 1348 (29 Mar) | 100 | 49 | 2 Jan | 8 May | ||||
| 26. | Goldeneye | 0 | 0 | 5 | 0 | 0 | 5 | 3 | 2 | 3 (19 Mar) | 4 | 2 | 9 Mar | 19 Mar | ||||
| 27. | Smew | 3 | 0 | 0 | 0 | 0 | 3 | 3 | 0 | 2 (22 Jan) | 4 | 2 | 11 Jan | 22 Jan | ||||
| 28. | Goosander | 0 | 0 | 6 | 0 | 0 | 6 | 0 | 6 | 4 (20 Mar) | 4 | 2 | 9 Mar | 20 Mar | ||||
| 29. | Red-breasted Merganser | 0 | 6 | 222 | 218 | 4 | 450 | 22 | 428 | 58 ( 8 Apr) | 61 | 30 | 6 Feb | 3 May | ||||
| 30. | Swift | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 1 (26 Apr) | 2 | 1 | 26 Apr | 26 Apr | ||||
| Species | Jan | Feb | Mar | Apr | May | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 31. | Red-necked Grebe | 1 | 1 | 0 | 0 | 0 | 2 | 2 | 0 | 1 (22 Jan) | 4 | 2 | 22 Jan | 15 Feb | ||||
| 32. | Great Crested Grebe | 212 | 49 | 43 | 27 | 17 | 348 | 245 | 103 | 181 (22 Jan) | 67 | 33 | 2 Jan | 7 May | ||||
| 33. | Oystercatcher | 0 | 20 | 114 | 346 | 112 | 592 | 173 | 419 | 56 (21 Mar) | 76 | 37 | 15 Feb | 8 May | ||||
| 34. | Avocet | 0 | 0 | 389 | 31 | 4 | 424 | 3 | 421 | 173 (20 Mar) | 29 | 14 | 8 Mar | 7 May | ||||
| 35. | Grey Plover | 0 | 0 | 47 | 189 | 469 | 705 | 0 | 705 | 405 ( 5 May) | 45 | 22 | 11 Mar | 8 May | ||||
| 36. | Golden Plover | 0 | 0 | 0 | 1 | 2 | 3 | 0 | 3 | 2 ( 4 May) | 4 | 2 | 27 Apr | 4 May | ||||
| 37. | Ringed Plover | 0 | 1 | 5 | 11 | 33 | 50 | 0 | 50 | 20 ( 1 May) | 22 | 11 | 18 Feb | 5 May | ||||
| 38. | Little Ringed Plover | 0 | 0 | 0 | 2 | 0 | 2 | 0 | 2 | 1 ( 4 Apr) | 4 | 2 | 4 Apr | 27 Apr | ||||
| 39. | Kentish Plover | 0 | 0 | 0 | 2 | 0 | 2 | 0 | 2 | 2 ( 6 Apr) | 2 | 1 | 6 Apr | 6 Apr | ||||
| 40. | Whimbrel | 0 | 0 | 0 | 226 | 70 | 296 | 0 | 296 | 69 ( 4 Apr) | 37 | 18 | 3 Apr | 8 May | ||||
| 41. | Curlew | 0 | 4 | 40 | 44 | 3 | 91 | 5 | 86 | 33 (16 Apr) | 43 | 21 | 15 Feb | 5 May | ||||
| 42. | Bar-tailed Godwit | 0 | 0 | 21 | 677 | 189 | 887 | 0 | 887 | 378 (21 Apr) | 33 | 16 | 21 Mar | 8 May | ||||
| 43. | Black-tailed Godwit | 0 | 0 | 4 | 1 | 0 | 5 | 4 | 1 | 4 ( 8 Mar) | 4 | 2 | 8 Mar | 30 Apr | ||||
| 44. | Snipe | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 (19 Mar) | 2 | 1 | 19 Mar | 19 Mar | ||||
| 45. | Common Sandpiper | 0 | 0 | 0 | 6 | 0 | 6 | 0 | 6 | 6 (30 Apr) | 2 | 1 | 30 Apr | 30 Apr | ||||
| 46. | Redshank | 0 | 0 | 5 | 58 | 20 | 83 | 1 | 82 | 27 (21 Apr) | 24 | 12 | 11 Mar | 5 May | ||||
| 47. | Spotted Redshank | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 1 (26 Apr) | 2 | 1 | 26 Apr | 26 Apr | ||||
| 48. | Greenshank | 0 | 0 | 0 | 46 | 2 | 48 | 0 | 48 | 19 (21 Apr) | 12 | 6 | 19 Apr | 5 May | ||||
| 49. | Turnstone | 0 | 0 | 1 | 11 | 58 | 70 | 1 | 69 | 53 ( 5 May) | 10 | 5 | 20 Mar | 7 May | ||||
| 50. | Knot | 0 | 0 | 4 | 152 | 2117 | 2273 | 0 | 2273 | 2006 ( 5 May) | 27 | 13 | 15 Mar | 8 May | ||||
| 51. | Ruff | 0 | 0 | 1 | 25 | 0 | 26 | 0 | 26 | 19 ( 6 Apr) | 8 | 4 | 9 Mar | 30 Apr | ||||
| 52. | wader sp. | 0 | 0 | 3 | 2 | 2 | 7 | 0 | 7 | 3 (15 Mar) | 6 | 3 | 15 Mar | 5 May | ||||
| 53. | small wader | 0 | 0 | 0 | 2 | 0 | 2 | 0 | 2 | 2 (19 Apr) | 2 | 1 | 19 Apr | 19 Apr | ||||
| 54. | Curlew Sandpiper | 0 | 0 | 0 | 0 | 3 | 3 | 0 | 3 | 3 ( 5 May) | 2 | 1 | 5 May | 5 May | ||||
| 55. | Sanderling | 3 | 23 | 198 | 400 | 342 | 966 | 2 | 964 | 190 ( 5 May) | 57 | 28 | 11 Jan | 8 May | ||||
| 56. | Dunlin | 0 | 182 | 2096 | 4739 | 116 | 7133 | 14 | 7119 | 2852 ( 4 Apr) | 67 | 33 | 5 Feb | 7 May | ||||
| 57. | Purple Sandpiper | 0 | 0 | 0 | 2 | 0 | 2 | 0 | 2 | 1 ( 4 Apr) | 4 | 2 | 4 Apr | 8 Apr | ||||
| 58. | Little Stint | 0 | 0 | 0 | 1 | 1 | 2 | 0 | 2 | 1 ( 4 Apr) | 4 | 2 | 4 Apr | 7 May | ||||
| 59. | Calidris sp. | 0 | 3 | 0 | 20 | 18 | 41 | 0 | 41 | 20 (21 Apr) | 6 | 3 | 5 Feb | 3 May | ||||
| 60. | Little Tern | 0 | 0 | 1 | 199 | 89 | 289 | 3 | 286 | 75 (26 Apr) | 27 | 13 | 31 Mar | 8 May | ||||
| Species | Jan | Feb | Mar | Apr | May | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 61. | Black Tern | 0 | 0 | 0 | 83 | 85 | 168 | 0 | 168 | 54 ( 5 May) | 20 | 10 | 8 Apr | 7 May | ||||
| 62. | Arctic Tern | 0 | 0 | 0 | 23 | 50 | 73 | 0 | 73 | 28 ( 4 May) | 10 | 5 | 19 Apr | 7 May | ||||
| 63. | Common/Arctic Tern | 0 | 0 | 0 | 2518 | 4925 | 7443 | 971 | 6472 | 2268 ( 3 May) | 27 | 13 | 5 Apr | 8 May | ||||
| 64. | Common Tern | 0 | 0 | 0 | 1032 | 70 | 1102 | 358 | 744 | 877 (21 Apr) | 22 | 11 | 2 Apr | 1 May | ||||
| 65. | Sandwich Tern | 0 | 0 | 91 | 4243 | 572 | 4906 | 1560 | 3346 | 820 (30 Apr) | 63 | 31 | 9 Mar | 8 May | ||||
| 66. | Little Gull | 0 | 5 | 313 | 6591 | 92 | 7001 | 66 | 6935 | 2835 (21 Apr) | 55 | 27 | 5 Feb | 8 May | ||||
| 67. | Kittiwake | 0 | 16 | 4 | 0 | 0 | 20 | 14 | 6 | 16 ( 5 Feb) | 8 | 4 | 5 Feb | 31 Mar | ||||
| 68. | Black-headed Gull | 102 | 99 | 1600 | 2334 | 339 | 4474 | 579 | 3895 | 625 ( 4 Apr) | 94 | 46 | 2 Jan | 8 May | ||||
| 69. | Mediterranean Gull | 0 | 0 | 5 | 13 | 4 | 22 | 3 | 19 | 3 (30 Apr) | 27 | 13 | 9 Mar | 8 May | ||||
| 70. | Common Gull | 49 | 266 | 2626 | 3950 | 750 | 7641 | 384 | 7257 | 586 ( 2 Apr) | 88 | 43 | 2 Jan | 7 May | ||||
| 71. | Caspian Gull | 0 | 0 | 4 | 0 | 0 | 4 | 1 | 3 | 1 ( 9 Mar) | 8 | 4 | 9 Mar | 29 Mar | ||||
| 72. | Herring Gull | 0 | 0 | 0 | 0 | 6 | 6 | 0 | 6 | 6 ( 8 May) | 2 | 1 | 8 May | 8 May | ||||
| 73. | Yellow-legged Gull | 0 | 0 | 1 | 2 | 0 | 3 | 0 | 3 | 1 (23 Mar) | 6 | 3 | 23 Mar | 27 Apr | ||||
| 74. | Great Black-backed Gull | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 (31 Jan) | 2 | 1 | 31 Jan | 31 Jan | ||||
| 75. | Lesser Black-backed Gull | 1 | 6 | 0 | 0 | 0 | 7 | 1 | 6 | 3 ( 5 Feb) | 6 | 3 | 11 Jan | 9 Feb | ||||
| 76. | Razorbill/Guillemot | 0 | 1 | 1 | 1 | 1 | 4 | 2 | 2 | 1 ( 5 Feb) | 8 | 4 | 5 Feb | 7 May | ||||
| 77. | Red-throated Diver | 175 | 51 | 80 | 35 | 4 | 345 | 185 | 160 | 131 (22 Jan) | 71 | 35 | 22 Jan | 7 May | ||||
| 78. | Black-throated Diver | 1 | 0 | 3 | 0 | 1 | 5 | 0 | 5 | 2 (26 Mar) | 8 | 4 | 31 Jan | 4 May | ||||
| 79. | diver sp. | 187 | 194 | 176 | 63 | 2 | 622 | 197 | 425 | 91 (26 Feb) | 65 | 32 | 2 Jan | 5 May | ||||
| 80. | Gannet | 29 | 14 | 240 | 31 | 23 | 337 | 106 | 231 | 64 (30 Mar) | 76 | 37 | 2 Jan | 7 May | ||||
| 81. | Cormorant | 0 | 51 | 0 | 0 | 0 | 51 | 28 | 23 | 51 (18 Feb) | 2 | 1 | 18 Feb | 18 Feb | ||||
| 82. | Spoonbill | 0 | 0 | 0 | 7 | 3 | 10 | 2 | 8 | 7 (27 Apr) | 6 | 3 | 27 Apr | 5 May | ||||
| 83. | Great White Egret | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 ( 3 May) | 2 | 1 | 3 May | 3 May | ||||
| 84. | Grey Heron | 0 | 0 | 5 | 4 | 1 | 10 | 0 | 10 | 4 (21 Mar) | 10 | 5 | 19 Mar | 8 May | ||||
| 85. | Osprey | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 ( 1 May) | 2 | 1 | 1 May | 1 May | ||||
| 86. | Kestrel | 0 | 0 | 0 | 2 | 0 | 2 | 0 | 2 | 2 ( 4 Apr) | 2 | 1 | 4 Apr | 4 Apr | ||||
| 87. | Merlin | 0 | 0 | 0 | 3 | 0 | 3 | 0 | 3 | 2 ( 4 Apr) | 4 | 2 | 4 Apr | 8 Apr | ||||
| 88. | Rook | 0 | 0 | 1 | 1 | 0 | 2 | 1 | 1 | 1 ( 8 Mar) | 4 | 2 | 8 Mar | 4 Apr | ||||
| 89. | Carrion Crow | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 1 (27 Apr) | 2 | 1 | 27 Apr | 27 Apr | ||||
| 90. | Skylark | 0 | 0 | 4 | 0 | 0 | 4 | 0 | 4 | 3 (23 Mar) | 4 | 2 | 20 Mar | 23 Mar | ||||
| Species | Jan | Feb | Mar | Apr | May | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 91. | Sand Martin | 0 | 0 | 0 | 15 | 2 | 17 | 0 | 17 | 14 ( 4 Apr) | 6 | 3 | 4 Apr | 7 May | ||||
| 92. | Swallow | 0 | 0 | 0 | 5 | 2 | 7 | 1 | 6 | 5 (27 Apr) | 4 | 2 | 27 Apr | 5 May | ||||
| 93. | House Martin | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 ( 5 May) | 2 | 1 | 5 May | 5 May | ||||
| 94. | alba wagtail sp. | 0 | 0 | 5 | 0 | 0 | 5 | 0 | 5 | 5 (20 Mar) | 2 | 1 | 20 Mar | 20 Mar | ||||
| 95. | Pied Wagtail | 0 | 0 | 2 | 0 | 0 | 2 | 1 | 1 | 1 (19 Mar) | 4 | 2 | 19 Mar | 23 Mar | ||||
| 96. | Rock Pipit | 0 | 0 | 2 | 3 | 0 | 5 | 0 | 5 | 3 ( 5 Apr) | 6 | 3 | 1 Mar | 5 Apr | ||||
| 97. | Lesser Redpoll | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 1 (27 Apr) | 2 | 1 | 27 Apr | 27 Apr | ||||
| 98. | Snow Bunting | 1 | 0 | 1 | 0 | 0 | 2 | 1 | 1 | 1 (11 Jan) | 4 | 2 | 11 Jan | 9 Mar | ||||
| Other species | ||||||||||||||||||
| Species | Jan | Feb | Mar | Apr | May | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 1. | Harbour Porpoise | 5 | 2 | 0 | 4 | 0 | 11 | 3 | 8 | 4 (22 Jan) | 10 | 5 | 11 Jan | 21 Apr | ||||
| 2. | Common Seal | 0 | 0 | 1 | 1 | 1 | 3 | 0 | 3 | 1 (22 Mar) | 6 | 3 | 22 Mar | 3 May | ||||
| Species | Jan | Feb | Mar | Apr | May | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| Totals | 1940 | 2489 | 23331 | 36665 | 13465 | 77890 | 9639 | 68251 | 100 | 49 | ||||||||
| Observation hours | 7:30 | 11:00 | 35:50 | 37:40 | 15:00 | 107:00 | ||||||||||||
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