Also present
Totals Fort Maarsseveen (Maarssen) 2021
| Species | Aug | Sep | Oct | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 1. | Barnacle Goose | 0 | 0 | 3 | 3 | 3 | 0 | 3 (16 Oct) | 25 | 1 | 16 Oct | 16 Oct | ||||
| 2. | Greylag Goose | 55 | 160 | 69 | 284 | 284 | 0 | 160 (26 Sep) | 100 | 4 | 28 Aug | 16 Oct | ||||
| 3. | Tundra Bean Goose | 0 | 0 | 20 | 20 | 20 | 0 | 20 ( 9 Oct) | 25 | 1 | 9 Oct | 9 Oct | ||||
| 4. | Eurasian White-fronted Goose | 0 | 55 | 79 | 134 | 126 | 8 | 55 (26 Sep) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 5. | Mute Swan | 0 | 0 | 7 | 7 | 7 | 0 | 7 ( 9 Oct) | 25 | 1 | 9 Oct | 9 Oct | ||||
| 6. | Egyptian Goose | 0 | 21 | 11 | 32 | 27 | 5 | 21 (26 Sep) | 50 | 2 | 26 Sep | 9 Oct | ||||
| 7. | Gadwall | 0 | 5 | 0 | 5 | 2 | 3 | 5 (26 Sep) | 25 | 1 | 26 Sep | 26 Sep | ||||
| 8. | Wigeon | 0 | 0 | 9 | 9 | 2 | 7 | 9 (16 Oct) | 25 | 1 | 16 Oct | 16 Oct | ||||
| 9. | Mallard | 0 | 1 | 3 | 4 | 4 | 0 | 2 ( 9 Oct) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 10. | Tufted Duck | 0 | 0 | 5 | 5 | 5 | 0 | 4 (16 Oct) | 50 | 2 | 9 Oct | 16 Oct | ||||
| 11. | Swift | 3 | 0 | 0 | 3 | 3 | 0 | 3 (28 Aug) | 25 | 1 | 28 Aug | 28 Aug | ||||
| 12. | Stock Dove | 0 | 3 | 28 | 31 | 31 | 0 | 26 (16 Oct) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 13. | Woodpigeon | 0 | 0 | 154 | 154 | 154 | 0 | 77 ( 9 Oct) | 50 | 2 | 9 Oct | 16 Oct | ||||
| 14. | Grey Plover | 0 | 0 | 2 | 2 | 2 | 0 | 2 (16 Oct) | 25 | 1 | 16 Oct | 16 Oct | ||||
| 15. | Lapwing | 0 | 134 | 219 | 353 | 269 | 84 | 164 ( 9 Oct) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 16. | Curlew | 0 | 0 | 1 | 1 | 1 | 0 | 1 (16 Oct) | 25 | 1 | 16 Oct | 16 Oct | ||||
| 17. | Snipe | 0 | 9 | 1 | 10 | 1 | 9 | 9 (26 Sep) | 50 | 2 | 26 Sep | 16 Oct | ||||
| 18. | Green Sandpiper | 1 | 1 | 4 | 6 | 6 | 0 | 2 ( 9 Oct) | 100 | 4 | 28 Aug | 16 Oct | ||||
| 19. | Caspian Tern | 1 | 0 | 0 | 1 | 1 | 0 | 1 (28 Aug) | 25 | 1 | 28 Aug | 28 Aug | ||||
| 20. | Black-headed Gull | 0 | 68 | 0 | 68 | 25 | 43 | 68 (26 Sep) | 25 | 1 | 26 Sep | 26 Sep | ||||
| 21. | Herring Gull | 0 | 3 | 7 | 10 | 10 | 0 | 7 (16 Oct) | 50 | 2 | 26 Sep | 16 Oct | ||||
| 22. | Lesser Black-backed Gull | 9 | 9 | 3 | 21 | 21 | 0 | 9 (28 Aug) | 75 | 3 | 28 Aug | 9 Oct | ||||
| 23. | Cormorant | 20 | 125 | 76 | 221 | 221 | 0 | 125 (26 Sep) | 100 | 4 | 28 Aug | 16 Oct | ||||
| 24. | Spoonbill | 6 | 0 | 0 | 6 | 6 | 0 | 6 (28 Aug) | 25 | 1 | 28 Aug | 28 Aug | ||||
| 25. | Great White Egret | 0 | 0 | 6 | 6 | 6 | 0 | 5 ( 9 Oct) | 50 | 2 | 9 Oct | 16 Oct | ||||
| 26. | Grey Heron | 0 | 0 | 4 | 4 | 4 | 0 | 4 ( 9 Oct) | 25 | 1 | 9 Oct | 9 Oct | ||||
| 27. | Sparrowhawk | 1 | 0 | 3 | 4 | 4 | 0 | 2 ( 9 Oct) | 75 | 3 | 28 Aug | 16 Oct | ||||
| 28. | Marsh Harrier | 0 | 0 | 1 | 1 | 1 | 0 | 1 ( 9 Oct) | 25 | 1 | 9 Oct | 9 Oct | ||||
| 29. | Common Buzzard | 0 | 0 | 1 | 1 | 1 | 0 | 1 ( 9 Oct) | 25 | 1 | 9 Oct | 9 Oct | ||||
| 30. | Merlin | 0 | 0 | 1 | 1 | 1 | 0 | 1 ( 9 Oct) | 25 | 1 | 9 Oct | 9 Oct | ||||
| Species | Aug | Sep | Oct | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 31. | Hobby | 0 | 2 | 0 | 2 | 2 | 0 | 2 (26 Sep) | 25 | 1 | 26 Sep | 26 Sep | ||||
| 32. | Peregrine | 0 | 0 | 2 | 2 | 2 | 0 | 1 ( 9 Oct) | 50 | 2 | 9 Oct | 16 Oct | ||||
| 33. | Jay | 0 | 76 | 12 | 88 | 88 | 0 | 76 (26 Sep) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 34. | Jackdaw | 0 | 0 | 51 | 51 | 35 | 16 | 51 ( 9 Oct) | 25 | 1 | 9 Oct | 9 Oct | ||||
| 35. | Carrion Crow | 0 | 0 | 1 | 1 | 1 | 0 | 1 (16 Oct) | 25 | 1 | 16 Oct | 16 Oct | ||||
| 36. | Coal Tit | 0 | 0 | 3 | 3 | 3 | 0 | 3 (16 Oct) | 25 | 1 | 16 Oct | 16 Oct | ||||
| 37. | Blue Tit | 0 | 1 | 81 | 82 | 82 | 0 | 79 (16 Oct) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 38. | Great Tit | 0 | 0 | 45 | 45 | 45 | 0 | 45 (16 Oct) | 25 | 1 | 16 Oct | 16 Oct | ||||
| 39. | Skylark | 0 | 0 | 78 | 78 | 68 | 10 | 48 (16 Oct) | 50 | 2 | 9 Oct | 16 Oct | ||||
| 40. | Swallow | 0 | 88 | 7 | 95 | 95 | 0 | 88 (26 Sep) | 50 | 2 | 26 Sep | 9 Oct | ||||
| 41. | House Martin | 2 | 0 | 0 | 2 | 2 | 0 | 2 (28 Aug) | 25 | 1 | 28 Aug | 28 Aug | ||||
| 42. | Chiffchaff | 0 | 2 | 0 | 2 | 2 | 0 | 2 (26 Sep) | 25 | 1 | 26 Sep | 26 Sep | ||||
| 43. | Starling | 0 | 0 | 11 | 11 | 11 | 0 | 11 (16 Oct) | 25 | 1 | 16 Oct | 16 Oct | ||||
| 44. | Song Thrush | 0 | 87 | 334 | 421 | 409 | 12 | 220 ( 9 Oct) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 45. | Mistle Thrush | 0 | 2 | 1 | 3 | 3 | 0 | 2 (26 Sep) | 50 | 2 | 26 Sep | 16 Oct | ||||
| 46. | Redwing | 0 | 0 | 219 | 219 | 219 | 0 | 218 (16 Oct) | 50 | 2 | 9 Oct | 16 Oct | ||||
| 47. | Blackbird | 0 | 2 | 14 | 16 | 16 | 0 | 8 ( 9 Oct) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 48. | Fieldfare | 0 | 0 | 2 | 2 | 2 | 0 | 2 ( 9 Oct) | 25 | 1 | 9 Oct | 9 Oct | ||||
| 49. | Dunnock | 0 | 5 | 9 | 14 | 14 | 0 | 5 (26 Sep) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 50. | Blue-headed Wagtail | 1 | 5 | 0 | 6 | 6 | 0 | 5 (26 Sep) | 50 | 2 | 28 Aug | 26 Sep | ||||
| 51. | Grey Wagtail | 0 | 0 | 2 | 2 | 2 | 0 | 2 (16 Oct) | 25 | 1 | 16 Oct | 16 Oct | ||||
| 52. | White Wagtail | 0 | 7 | 6 | 13 | 13 | 0 | 7 (26 Sep) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 53. | Meadow Pipit | 0 | 176 | 97 | 273 | 273 | 0 | 176 (26 Sep) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 54. | Chaffinch | 0 | 43 | 2469 | 2512 | 2504 | 8 | 2416 (16 Oct) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 55. | Brambling | 0 | 0 | 100 | 100 | 100 | 0 | 94 (16 Oct) | 50 | 2 | 9 Oct | 16 Oct | ||||
| 56. | Hawfinch | 0 | 6 | 38 | 44 | 32 | 12 | 26 (16 Oct) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 57. | Bullfinch | 0 | 0 | 2 | 2 | 2 | 0 | 2 ( 9 Oct) | 25 | 1 | 9 Oct | 9 Oct | ||||
| 58. | Greenfinch | 0 | 2 | 2 | 4 | 4 | 0 | 2 (26 Sep) | 75 | 3 | 26 Sep | 16 Oct | ||||
| 59. | Crossbill | 0 | 9 | 0 | 9 | 9 | 0 | 9 (26 Sep) | 25 | 1 | 26 Sep | 26 Sep | ||||
| 60. | Siskin | 0 | 5 | 532 | 537 | 537 | 0 | 496 (16 Oct) | 75 | 3 | 26 Sep | 16 Oct | ||||
| Species | Aug | Sep | Oct | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 61. | Reed Bunting | 0 | 1 | 8 | 9 | 9 | 0 | 7 (16 Oct) | 75 | 3 | 26 Sep | 16 Oct | ||||
| Species | Aug | Sep | Oct | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| Totals | 99 | 1113 | 4843 | 6055 | 5838 | 217 | 100 | 4 | ||||||||
| Observation hours | 3:00 | 4:45 | 8:00 | 15:45 | ||||||||||||
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