Also present
Totals Fort Maarsseveen (Maarssen) 2023
| Species | Sep | Oct | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 1. | Canada Goose | 94 | 16 | 110 | 78 | 32 | 52 (30 Sep) | 71 | 5 | 2 Sep | 15 Oct | ||||
| 2. | Barnacle Goose | 0 | 6 | 6 | 6 | 0 | 6 (15 Oct) | 14 | 1 | 15 Oct | 15 Oct | ||||
| 3. | Greylag Goose | 845 | 426 | 1271 | 1259 | 12 | 461 ( 9 Sep) | 100 | 7 | 2 Sep | 29 Oct | ||||
| 4. | Eurasian White-fronted Goose | 0 | 828 | 828 | 812 | 16 | 497 (22 Oct) | 43 | 3 | 15 Oct | 29 Oct | ||||
| 5. | Mute Swan | 13 | 15 | 28 | 27 | 1 | 13 (30 Sep) | 71 | 5 | 30 Sep | 29 Oct | ||||
| 6. | Egyptian Goose | 5 | 56 | 61 | 60 | 1 | 27 ( 7 Oct) | 86 | 6 | 2 Sep | 29 Oct | ||||
| 7. | Shelduck | 0 | 6 | 6 | 6 | 0 | 6 (15 Oct) | 14 | 1 | 15 Oct | 15 Oct | ||||
| 8. | Shoveler | 0 | 17 | 17 | 12 | 5 | 9 (15 Oct) | 29 | 2 | 15 Oct | 29 Oct | ||||
| 9. | Gadwall | 31 | 42 | 73 | 71 | 2 | 25 (15 Oct) | 86 | 6 | 9 Sep | 29 Oct | ||||
| 10. | Wigeon | 6 | 19 | 25 | 25 | 0 | 18 (29 Oct) | 43 | 3 | 30 Sep | 29 Oct | ||||
| 11. | Mallard | 19 | 26 | 45 | 45 | 0 | 17 (15 Oct) | 86 | 6 | 2 Sep | 29 Oct | ||||
| 12. | Pintail | 0 | 8 | 8 | 8 | 0 | 5 (15 Oct) | 29 | 2 | 7 Oct | 15 Oct | ||||
| 13. | Pochard | 1 | 0 | 1 | 1 | 0 | 1 ( 9 Sep) | 14 | 1 | 9 Sep | 9 Sep | ||||
| 14. | Tufted Duck | 5 | 4 | 9 | 8 | 1 | 4 ( 9 Sep) | 71 | 5 | 2 Sep | 29 Oct | ||||
| 15. | Stock Dove | 26 | 31 | 57 | 56 | 1 | 14 ( 2 Sep) | 86 | 6 | 2 Sep | 29 Oct | ||||
| 16. | Woodpigeon | 35 | 105 | 140 | 140 | 0 | 33 (30 Sep) | 86 | 6 | 2 Sep | 29 Oct | ||||
| 17. | Collared Dove | 1 | 0 | 1 | 1 | 0 | 1 ( 9 Sep) | 14 | 1 | 9 Sep | 9 Sep | ||||
| 18. | Lapwing | 717 | 966 | 1683 | 1575 | 108 | 867 (22 Oct) | 100 | 7 | 2 Sep | 29 Oct | ||||
| 19. | Snipe | 43 | 6 | 49 | 44 | 5 | 19 ( 9 Sep) | 71 | 5 | 2 Sep | 29 Oct | ||||
| 20. | Green Sandpiper | 0 | 5 | 5 | 5 | 0 | 5 (15 Oct) | 14 | 1 | 15 Oct | 15 Oct | ||||
| 21. | Black-headed Gull | 22 | 76 | 98 | 98 | 0 | 48 ( 7 Oct) | 86 | 6 | 2 Sep | 29 Oct | ||||
| 22. | Common Gull | 0 | 4 | 4 | 4 | 0 | 2 ( 7 Oct) | 43 | 3 | 7 Oct | 22 Oct | ||||
| 23. | Caspian Gull | 0 | 1 | 1 | 1 | 0 | 1 (15 Oct) | 14 | 1 | 15 Oct | 15 Oct | ||||
| 24. | Herring Gull | 27 | 17 | 44 | 44 | 0 | 24 (30 Sep) | 86 | 6 | 9 Sep | 29 Oct | ||||
| 25. | Great Black-backed Gull | 0 | 1 | 1 | 1 | 0 | 1 (15 Oct) | 14 | 1 | 15 Oct | 15 Oct | ||||
| 26. | Lesser Black-backed Gull | 55 | 9 | 64 | 64 | 0 | 51 (30 Sep) | 86 | 6 | 9 Sep | 29 Oct | ||||
| 27. | White Stork | 26 | 0 | 26 | 26 | 0 | 25 (30 Sep) | 29 | 2 | 9 Sep | 30 Sep | ||||
| 28. | Cormorant | 175 | 1002 | 1177 | 1169 | 8 | 932 (15 Oct) | 100 | 7 | 2 Sep | 29 Oct | ||||
| 29. | Spoonbill | 1 | 3 | 4 | 4 | 0 | 2 ( 7 Oct) | 43 | 3 | 2 Sep | 15 Oct | ||||
| 30. | Great White Egret | 7 | 8 | 15 | 15 | 0 | 7 (15 Oct) | 57 | 4 | 9 Sep | 15 Oct | ||||
| Species | Sep | Oct | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 31. | Grey Heron | 8 | 2 | 10 | 10 | 0 | 5 (30 Sep) | 43 | 3 | 9 Sep | 15 Oct | ||||
| 32. | Osprey | 1 | 1 | 2 | 2 | 0 | 1 (30 Sep) | 29 | 2 | 30 Sep | 7 Oct | ||||
| 33. | Sparrowhawk | 5 | 3 | 8 | 8 | 0 | 3 (30 Sep) | 43 | 3 | 9 Sep | 22 Oct | ||||
| 34. | Marsh Harrier | 2 | 3 | 5 | 4 | 1 | 2 (30 Sep) | 57 | 4 | 30 Sep | 29 Oct | ||||
| 35. | Common Buzzard | 10 | 4 | 14 | 14 | 0 | 8 (30 Sep) | 57 | 4 | 9 Sep | 22 Oct | ||||
| 36. | Great Spotted Woodpecker | 6 | 2 | 8 | 8 | 0 | 5 (30 Sep) | 43 | 3 | 9 Sep | 22 Oct | ||||
| 37. | Kestrel | 3 | 0 | 3 | 3 | 0 | 2 (30 Sep) | 29 | 2 | 9 Sep | 30 Sep | ||||
| 38. | Hobby | 1 | 0 | 1 | 1 | 0 | 1 ( 9 Sep) | 14 | 1 | 9 Sep | 9 Sep | ||||
| 39. | Peregrine | 1 | 0 | 1 | 1 | 0 | 1 ( 9 Sep) | 14 | 1 | 9 Sep | 9 Sep | ||||
| 40. | Jay | 11 | 1 | 12 | 12 | 0 | 10 (30 Sep) | 43 | 3 | 9 Sep | 15 Oct | ||||
| 41. | Magpie | 0 | 3 | 3 | 3 | 0 | 3 (29 Oct) | 14 | 1 | 29 Oct | 29 Oct | ||||
| 42. | Jackdaw | 15 | 13 | 28 | 19 | 9 | 15 (30 Sep) | 43 | 3 | 30 Sep | 29 Oct | ||||
| 43. | Blue Tit | 8 | 22 | 30 | 30 | 0 | 16 (22 Oct) | 86 | 6 | 9 Sep | 29 Oct | ||||
| 44. | Great Tit | 0 | 8 | 8 | 8 | 0 | 3 (22 Oct) | 57 | 4 | 7 Oct | 29 Oct | ||||
| 45. | Wood Lark | 0 | 2 | 2 | 2 | 0 | 2 (15 Oct) | 14 | 1 | 15 Oct | 15 Oct | ||||
| 46. | Skylark | 0 | 91 | 91 | 91 | 0 | 84 (15 Oct) | 43 | 3 | 15 Oct | 29 Oct | ||||
| 47. | Swallow | 261 | 6 | 267 | 266 | 1 | 145 ( 9 Sep) | 57 | 4 | 2 Sep | 7 Oct | ||||
| 48. | House Martin | 23 | 0 | 23 | 23 | 0 | 12 ( 9 Sep) | 43 | 3 | 2 Sep | 30 Sep | ||||
| 49. | Firecrest | 1 | 0 | 1 | 1 | 0 | 1 (30 Sep) | 14 | 1 | 30 Sep | 30 Sep | ||||
| 50. | Starling | 169 | 688 | 857 | 702 | 155 | 425 (15 Oct) | 57 | 4 | 30 Sep | 29 Oct | ||||
| 51. | Song Thrush | 5 | 35 | 40 | 40 | 0 | 23 ( 7 Oct) | 71 | 5 | 30 Sep | 29 Oct | ||||
| 52. | Redwing | 0 | 207 | 207 | 198 | 9 | 75 (22 Oct) | 43 | 3 | 7 Oct | 22 Oct | ||||
| 53. | Blackbird | 0 | 2 | 2 | 2 | 0 | 1 ( 7 Oct) | 29 | 2 | 7 Oct | 22 Oct | ||||
| 54. | Fieldfare | 0 | 27 | 27 | 27 | 0 | 20 (22 Oct) | 43 | 3 | 15 Oct | 29 Oct | ||||
| 55. | Wheatear | 1 | 0 | 1 | 1 | 0 | 1 (30 Sep) | 14 | 1 | 30 Sep | 30 Sep | ||||
| 56. | Dunnock | 20 | 9 | 29 | 29 | 0 | 20 (30 Sep) | 43 | 3 | 30 Sep | 15 Oct | ||||
| 57. | Blue-headed Wagtail | 4 | 0 | 4 | 4 | 0 | 2 ( 2 Sep) | 29 | 2 | 2 Sep | 9 Sep | ||||
| 58. | Grey Wagtail | 6 | 8 | 14 | 14 | 0 | 6 (30 Sep) | 57 | 4 | 30 Sep | 22 Oct | ||||
| 59. | White Wagtail | 37 | 15 | 52 | 50 | 2 | 27 (30 Sep) | 100 | 7 | 2 Sep | 29 Oct | ||||
| 60. | alba wagtail sp. | 0 | 1 | 1 | 1 | 0 | 1 (29 Oct) | 14 | 1 | 29 Oct | 29 Oct | ||||
| Species | Sep | Oct | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 61. | Meadow Pipit | 1249 | 275 | 1524 | 1519 | 5 | 1248 (30 Sep) | 86 | 6 | 9 Sep | 29 Oct | ||||
| 62. | Tree Pipit | 2 | 0 | 2 | 2 | 0 | 2 ( 9 Sep) | 14 | 1 | 9 Sep | 9 Sep | ||||
| 63. | Water Pipit | 0 | 4 | 4 | 4 | 0 | 4 (29 Oct) | 14 | 1 | 29 Oct | 29 Oct | ||||
| 64. | Chaffinch | 110 | 610 | 720 | 711 | 9 | 385 (15 Oct) | 86 | 6 | 9 Sep | 29 Oct | ||||
| 65. | Brambling | 0 | 5 | 5 | 5 | 0 | 5 (15 Oct) | 14 | 1 | 15 Oct | 15 Oct | ||||
| 66. | Hawfinch | 1 | 14 | 15 | 15 | 0 | 8 (15 Oct) | 57 | 4 | 30 Sep | 22 Oct | ||||
| 67. | Bullfinch | 1 | 0 | 1 | 1 | 0 | 1 (30 Sep) | 14 | 1 | 30 Sep | 30 Sep | ||||
| 68. | Greenfinch | 1 | 2 | 3 | 3 | 0 | 1 (30 Sep) | 43 | 3 | 30 Sep | 22 Oct | ||||
| 69. | Linnet | 5 | 2 | 7 | 7 | 0 | 5 (30 Sep) | 43 | 3 | 30 Sep | 29 Oct | ||||
| 70. | redpoll sp. | 0 | 3 | 3 | 2 | 1 | 2 (15 Oct) | 29 | 2 | 15 Oct | 22 Oct | ||||
| 71. | Crossbill | 16 | 0 | 16 | 14 | 2 | 14 (30 Sep) | 29 | 2 | 2 Sep | 30 Sep | ||||
| 72. | Goldfinch | 30 | 2 | 32 | 32 | 0 | 30 ( 9 Sep) | 43 | 3 | 9 Sep | 22 Oct | ||||
| 73. | Siskin | 544 | 444 | 988 | 981 | 7 | 544 (30 Sep) | 57 | 4 | 30 Sep | 22 Oct | ||||
| 74. | Yellowhammer | 1 | 0 | 1 | 1 | 0 | 1 (30 Sep) | 14 | 1 | 30 Sep | 30 Sep | ||||
| 75. | Reed Bunting | 0 | 5 | 5 | 5 | 0 | 3 (15 Oct) | 43 | 3 | 7 Oct | 29 Oct | ||||
| 76. | passerine sp. | 0 | 1 | 1 | 1 | 0 | 1 (15 Oct) | 14 | 1 | 15 Oct | 15 Oct | ||||
| Species | Sep | Oct | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| Totals | 4712 | 6223 | 10935 | 10542 | 393 | 100 | 7 | ||||||||
| Observation hours | 16:00 | 13:49 | 29:49 | ||||||||||||
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