Also present
Totals Fort Maarsseveen (Maarssen) 1979
| Species | Aug | Sep | Oct | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 1. | Northern Shoveler | 0 | 0 | 19 | 19 | 19 | 0 | 19 (14 Oct) | 20 | 1 | 14 Oct | 14 Oct | ||||
| 2. | Mallard | 71 | 0 | 79 | 150 | 150 | 0 | 79 (14 Oct) | 100 | 5 | 11 Aug | 14 Oct | ||||
| 3. | Aythya sp. | 7 | 0 | 0 | 7 | 7 | 0 | 5 (12 Aug) | 40 | 2 | 11 Aug | 12 Aug | ||||
| 4. | Swift | 32 | 0 | 0 | 32 | 32 | 0 | 22 (15 Aug) | 80 | 4 | 11 Aug | 18 Aug | ||||
| 5. | Cuckoo | 6 | 0 | 0 | 6 | 6 | 0 | 2 (11 Aug) | 60 | 3 | 11 Aug | 18 Aug | ||||
| 6. | Stock Dove | 5 | 0 | 0 | 5 | 5 | 0 | 5 (11 Aug) | 20 | 1 | 11 Aug | 11 Aug | ||||
| 7. | Woodpigeon | 49 | 0 | 11 | 60 | 60 | 0 | 29 (18 Aug) | 100 | 5 | 11 Aug | 14 Oct | ||||
| 8. | Turtle Dove | 8 | 0 | 0 | 8 | 8 | 0 | 3 (12 Aug) | 60 | 3 | 11 Aug | 15 Aug | ||||
| 9. | Eurasian Collared-Dove | 12 | 0 | 0 | 12 | 12 | 0 | 4 (11 Aug) | 80 | 4 | 11 Aug | 18 Aug | ||||
| 10. | Oystercatcher | 12 | 0 | 3 | 15 | 15 | 0 | 5 (12 Aug) | 80 | 4 | 11 Aug | 14 Oct | ||||
| 11. | Black-bellied Plover | 2 | 0 | 0 | 2 | 2 | 0 | 2 (11 Aug) | 20 | 1 | 11 Aug | 11 Aug | ||||
| 12. | European Golden-Plover | 9 | 0 | 0 | 9 | 9 | 0 | 4 (18 Aug) | 80 | 4 | 11 Aug | 18 Aug | ||||
| 13. | Ringed Plover | 1 | 0 | 0 | 1 | 1 | 0 | 1 (12 Aug) | 20 | 1 | 12 Aug | 12 Aug | ||||
| 14. | Northern Lapwing | 486 | 0 | 117 | 603 | 603 | 0 | 253 (18 Aug) | 100 | 5 | 11 Aug | 14 Oct | ||||
| 15. | Whimbrel (European) | 18 | 0 | 0 | 18 | 18 | 0 | 9 (11 Aug) | 40 | 2 | 11 Aug | 12 Aug | ||||
| 16. | Curlew | 2 | 0 | 0 | 2 | 2 | 0 | 1 (12 Aug) | 40 | 2 | 12 Aug | 18 Aug | ||||
| 17. | Black-tailed Godwit | 200 | 0 | 0 | 200 | 200 | 0 | 200 (15 Aug) | 20 | 1 | 15 Aug | 15 Aug | ||||
| 18. | Snipe | 26 | 0 | 0 | 26 | 26 | 0 | 21 (15 Aug) | 40 | 2 | 12 Aug | 15 Aug | ||||
| 19. | Common Sandpiper | 7 | 0 | 0 | 7 | 7 | 0 | 3 (11 Aug) | 80 | 4 | 11 Aug | 18 Aug | ||||
| 20. | Common Tern | 4 | 0 | 0 | 4 | 4 | 0 | 3 (12 Aug) | 40 | 2 | 12 Aug | 18 Aug | ||||
| 21. | Black-headed Gull | 690 | 0 | 164 | 854 | 854 | 0 | 539 (18 Aug) | 100 | 5 | 11 Aug | 14 Oct | ||||
| 22. | Mew Gull (European) | 80 | 0 | 0 | 80 | 80 | 0 | 27 (18 Aug) | 80 | 4 | 11 Aug | 18 Aug | ||||
| 23. | Herring Gull | 17 | 0 | 0 | 17 | 17 | 0 | 8 (12 Aug) | 80 | 4 | 11 Aug | 18 Aug | ||||
| 24. | Great Black-backed Gull | 1 | 0 | 0 | 1 | 1 | 0 | 1 (12 Aug) | 20 | 1 | 12 Aug | 12 Aug | ||||
| 25. | Cormorant | 97 | 0 | 0 | 97 | 97 | 0 | 88 (12 Aug) | 60 | 3 | 11 Aug | 15 Aug | ||||
| 26. | Spoonbill | 8 | 0 | 0 | 8 | 8 | 0 | 8 (12 Aug) | 20 | 1 | 12 Aug | 12 Aug | ||||
| 27. | Grey Heron | 15 | 0 | 0 | 15 | 15 | 0 | 9 (18 Aug) | 60 | 3 | 11 Aug | 18 Aug | ||||
| 28. | Purple Heron | 19 | 0 | 0 | 19 | 19 | 0 | 8 (11 Aug) | 60 | 3 | 11 Aug | 15 Aug | ||||
| 29. | Black Kite | 1 | 0 | 0 | 1 | 1 | 0 | 1 (15 Aug) | 20 | 1 | 15 Aug | 15 Aug | ||||
| 30. | Common Buzzard | 0 | 0 | 2 | 2 | 2 | 0 | 2 (14 Oct) | 20 | 1 | 14 Oct | 14 Oct | ||||
| Species | Aug | Sep | Oct | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 31. | Great Spotted Woodpecker | 3 | 0 | 2 | 5 | 5 | 0 | 2 (12 Aug) | 60 | 3 | 12 Aug | 14 Oct | ||||
| 32. | Hobby | 2 | 0 | 0 | 2 | 2 | 0 | 1 (11 Aug) | 40 | 2 | 11 Aug | 18 Aug | ||||
| 33. | Jay | 0 | 0 | 1 | 1 | 1 | 0 | 1 (14 Oct) | 20 | 1 | 14 Oct | 14 Oct | ||||
| 34. | Eurasian Jackdaw | 5 | 0 | 0 | 5 | 5 | 0 | 3 (12 Aug) | 40 | 2 | 12 Aug | 18 Aug | ||||
| 35. | Carrion Crow | 5 | 0 | 0 | 5 | 5 | 0 | 5 (15 Aug) | 20 | 1 | 15 Aug | 15 Aug | ||||
| 36. | Blue Tit | 1 | 0 | 0 | 1 | 1 | 0 | 1 (18 Aug) | 20 | 1 | 18 Aug | 18 Aug | ||||
| 37. | Great Tit | 1 | 0 | 2 | 3 | 3 | 0 | 2 (14 Oct) | 40 | 2 | 18 Aug | 14 Oct | ||||
| 38. | Eurasian Skylark | 2 | 0 | 12 | 14 | 14 | 0 | 12 (14 Oct) | 40 | 2 | 18 Aug | 14 Oct | ||||
| 39. | Bank Swallow | 1 | 0 | 0 | 1 | 1 | 0 | 1 (11 Aug) | 20 | 1 | 11 Aug | 11 Aug | ||||
| 40. | Barn Swallow | 934 | 0 | 5 | 939 | 939 | 0 | 491 (18 Aug) | 100 | 5 | 11 Aug | 14 Oct | ||||
| 41. | House Martin | 2184 | 0 | 2 | 2186 | 2186 | 0 | 879 (11 Aug) | 100 | 5 | 11 Aug | 14 Oct | ||||
| 42. | Willow Warbler | 4 | 0 | 0 | 4 | 4 | 0 | 3 (15 Aug) | 40 | 2 | 11 Aug | 15 Aug | ||||
| 43. | European Starling | 160 | 0 | 60 | 220 | 220 | 0 | 112 (18 Aug) | 100 | 5 | 11 Aug | 14 Oct | ||||
| 44. | Song Thrush | 0 | 0 | 3 | 3 | 3 | 0 | 3 (14 Oct) | 20 | 1 | 14 Oct | 14 Oct | ||||
| 45. | Redwing | 0 | 0 | 14 | 14 | 14 | 0 | 14 (14 Oct) | 20 | 1 | 14 Oct | 14 Oct | ||||
| 46. | Blackbird | 0 | 0 | 1 | 1 | 1 | 0 | 1 (14 Oct) | 20 | 1 | 14 Oct | 14 Oct | ||||
| 47. | White Wagtail | 26 | 0 | 1 | 27 | 27 | 0 | 14 (15 Aug) | 100 | 5 | 11 Aug | 14 Oct | ||||
| 48. | Common Chaffinch | 12 | 0 | 2 | 14 | 14 | 0 | 7 (18 Aug) | 80 | 4 | 11 Aug | 14 Oct | ||||
| 49. | European Greenfinch | 4 | 0 | 0 | 4 | 4 | 0 | 2 (11 Aug) | 40 | 2 | 11 Aug | 12 Aug | ||||
| 50. | Common Linnet | 3 | 0 | 0 | 3 | 3 | 0 | 1 (11 Aug) | 60 | 3 | 11 Aug | 15 Aug | ||||
| 51. | Goldfinch | 0 | 0 | 41 | 41 | 41 | 0 | 41 (14 Oct) | 20 | 1 | 14 Oct | 14 Oct | ||||
| Species | Aug | Sep | Oct | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| Totals | 5232 | 0 | 541 | 5773 | 5773 | 0 | 100 | 5 | ||||||||
| Observation hours | 30:45 | 0:00 | 1:45 | 32:30 | ||||||||||||
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