Also present
Totals Bertusnol, Texel 2020
| Species | Mar | Apr | May | Totals | SW | NE | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 1. | Dark-bellied Brent Goose | 2 | 43 | 0 | 45 | 0 | 45 | 23 (11 Apr) | 25 | 4 | 14 Mar | 23 Apr | ||||
| 2. | Canada Goose | 0 | 0 | 1 | 1 | 0 | 1 | 1 ( 4 May) | 6 | 1 | 4 May | 4 May | ||||
| 3. | Barnacle Goose | 98 | 15 | 8 | 121 | 44 | 77 | 98 (14 Mar) | 50 | 8 | 14 Mar | 21 May | ||||
| 4. | Greylag Goose | 8 | 22 | 0 | 30 | 15 | 15 | 8 (14 Mar) | 44 | 7 | 14 Mar | 19 Apr | ||||
| 5. | goose sp. | 0 | 2 | 0 | 2 | 0 | 2 | 2 (19 Apr) | 6 | 1 | 19 Apr | 19 Apr | ||||
| 6. | Black Swan | 0 | 0 | 1 | 1 | 0 | 1 | 1 ( 9 May) | 6 | 1 | 9 May | 9 May | ||||
| 7. | Mute Swan | 0 | 0 | 11 | 11 | 0 | 11 | 8 ( 6 May) | 13 | 2 | 6 May | 9 May | ||||
| 8. | Shelduck | 4 | 9 | 4 | 17 | 0 | 17 | 5 ( 7 Apr) | 25 | 4 | 14 Mar | 9 May | ||||
| 9. | Garganey | 0 | 8 | 0 | 8 | 0 | 8 | 5 (11 Apr) | 13 | 2 | 11 Apr | 17 Apr | ||||
| 10. | Shoveler | 0 | 87 | 0 | 87 | 6 | 81 | 31 ( 7 Apr) | 44 | 7 | 5 Apr | 23 Apr | ||||
| 11. | Gadwall | 0 | 34 | 11 | 45 | 9 | 36 | 11 (16 Apr) | 63 | 10 | 10 Apr | 9 May | ||||
| 12. | Wigeon | 5 | 55 | 0 | 60 | 2 | 58 | 50 ( 7 Apr) | 19 | 3 | 14 Mar | 23 Apr | ||||
| 13. | Mallard | 0 | 3 | 0 | 3 | 0 | 3 | 2 (19 Apr) | 13 | 2 | 16 Apr | 19 Apr | ||||
| 14. | Pintail | 0 | 16 | 0 | 16 | 0 | 16 | 5 (10 Apr) | 31 | 5 | 10 Apr | 23 Apr | ||||
| 15. | Teal | 2 | 98 | 0 | 100 | 4 | 96 | 61 ( 5 Apr) | 31 | 5 | 14 Mar | 18 Apr | ||||
| 16. | duck sp. | 0 | 25 | 0 | 25 | 0 | 25 | 21 (11 Apr) | 13 | 2 | 7 Apr | 11 Apr | ||||
| 17. | Pochard | 0 | 2 | 0 | 2 | 2 | 0 | 2 (11 Apr) | 6 | 1 | 11 Apr | 11 Apr | ||||
| 18. | Tufted Duck | 0 | 8 | 2 | 10 | 2 | 8 | 5 (11 Apr) | 19 | 3 | 10 Apr | 6 May | ||||
| 19. | Scaup | 0 | 2 | 0 | 2 | 0 | 2 | 2 (17 Apr) | 6 | 1 | 17 Apr | 17 Apr | ||||
| 20. | Eider | 23 | 1609 | 97 | 1729 | 1463 | 266 | 531 (10 Apr) | 100 | 16 | 14 Mar | 21 May | ||||
| 21. | Velvet Scoter | 0 | 3 | 5 | 8 | 5 | 3 | 5 ( 4 May) | 13 | 2 | 11 Apr | 4 May | ||||
| 22. | Common Scoter | 37 | 4527 | 420 | 4984 | 2378 | 2606 | 1230 ( 7 Apr) | 100 | 16 | 14 Mar | 21 May | ||||
| 23. | Goldeneye | 0 | 2 | 0 | 2 | 0 | 2 | 2 (23 Apr) | 6 | 1 | 23 Apr | 23 Apr | ||||
| 24. | Red-breasted Merganser | 9 | 23 | 0 | 32 | 9 | 23 | 9 (14 Mar) | 38 | 6 | 14 Mar | 23 Apr | ||||
| 25. | Swift | 0 | 0 | 13 | 13 | 0 | 13 | 9 ( 9 May) | 19 | 3 | 5 May | 9 May | ||||
| 26. | Feral Pigeon | 0 | 21 | 3 | 24 | 1 | 23 | 9 (10 Apr) | 31 | 5 | 10 Apr | 5 May | ||||
| 27. | Stock Dove | 0 | 4 | 6 | 10 | 1 | 9 | 3 ( 6 May) | 31 | 5 | 7 Apr | 9 May | ||||
| 28. | Woodpigeon | 16 | 300 | 366 | 682 | 23 | 659 | 107 ( 6 May) | 100 | 16 | 14 Mar | 21 May | ||||
| 29. | Collared Dove | 0 | 10 | 3 | 13 | 0 | 13 | 6 (19 Apr) | 31 | 5 | 5 Apr | 9 May | ||||
| 30. | Great Crested Grebe | 0 | 3 | 1 | 4 | 2 | 2 | 3 (18 Apr) | 13 | 2 | 18 Apr | 4 May | ||||
| Species | Mar | Apr | May | Totals | SW | NE | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 31. | Oystercatcher | 11 | 72 | 7 | 90 | 14 | 76 | 34 ( 7 Apr) | 69 | 11 | 14 Mar | 9 May | ||||
| 32. | Grey Plover | 0 | 1 | 3 | 4 | 0 | 4 | 3 ( 4 May) | 13 | 2 | 22 Apr | 4 May | ||||
| 33. | Golden Plover | 0 | 0 | 37 | 37 | 0 | 37 | 36 ( 6 May) | 13 | 2 | 5 May | 6 May | ||||
| 34. | Ringed Plover | 0 | 2 | 4 | 6 | 0 | 6 | 3 ( 9 May) | 19 | 3 | 22 Apr | 9 May | ||||
| 35. | Little Ringed Plover | 0 | 3 | 0 | 3 | 0 | 3 | 2 (19 Apr) | 13 | 2 | 19 Apr | 22 Apr | ||||
| 36. | Lapwing | 0 | 4 | 6 | 10 | 2 | 8 | 3 ( 6 May) | 38 | 6 | 10 Apr | 9 May | ||||
| 37. | Whimbrel | 0 | 82 | 21 | 103 | 0 | 103 | 30 (23 Apr) | 50 | 8 | 7 Apr | 9 May | ||||
| 38. | Curlew | 3 | 40 | 0 | 43 | 1 | 42 | 21 (19 Apr) | 56 | 9 | 14 Mar | 23 Apr | ||||
| 39. | Bar-tailed Godwit | 0 | 449 | 58 | 507 | 0 | 507 | 221 (19 Apr) | 44 | 7 | 16 Apr | 6 May | ||||
| 40. | Black-tailed Godwit | 0 | 2 | 0 | 2 | 2 | 0 | 2 (11 Apr) | 6 | 1 | 11 Apr | 11 Apr | ||||
| 41. | Snipe | 0 | 13 | 0 | 13 | 1 | 12 | 9 (23 Apr) | 25 | 4 | 7 Apr | 23 Apr | ||||
| 42. | Green Sandpiper | 0 | 12 | 0 | 12 | 1 | 11 | 10 (19 Apr) | 13 | 2 | 10 Apr | 19 Apr | ||||
| 43. | Wood Sandpiper | 0 | 1 | 0 | 1 | 0 | 1 | 1 (22 Apr) | 6 | 1 | 22 Apr | 22 Apr | ||||
| 44. | Redshank | 0 | 4 | 0 | 4 | 0 | 4 | 4 (11 Apr) | 6 | 1 | 11 Apr | 11 Apr | ||||
| 45. | Greenshank | 0 | 19 | 1 | 20 | 0 | 20 | 14 (23 Apr) | 38 | 6 | 16 Apr | 9 May | ||||
| 46. | Turnstone | 0 | 1 | 0 | 1 | 0 | 1 | 1 (19 Apr) | 6 | 1 | 19 Apr | 19 Apr | ||||
| 47. | Knot | 1 | 32 | 3 | 36 | 1 | 35 | 18 (19 Apr) | 38 | 6 | 14 Mar | 4 May | ||||
| 48. | wader sp. | 0 | 88 | 6 | 94 | 0 | 94 | 66 (23 Apr) | 38 | 6 | 11 Apr | 9 May | ||||
| 49. | Sanderling | 0 | 34 | 2 | 36 | 2 | 34 | 12 (11 Apr) | 38 | 6 | 10 Apr | 9 May | ||||
| 50. | Dunlin | 2 | 1 | 0 | 3 | 0 | 3 | 2 (14 Mar) | 13 | 2 | 14 Mar | 23 Apr | ||||
| 51. | Little Tern | 0 | 61 | 73 | 134 | 9 | 125 | 41 (19 Apr) | 69 | 11 | 10 Apr | 21 May | ||||
| 52. | Arctic Tern | 0 | 5 | 7 | 12 | 0 | 12 | 5 (19 Apr) | 19 | 3 | 19 Apr | 6 May | ||||
| 53. | Common/Arctic Tern | 0 | 1288 | 0 | 1288 | 0 | 1288 | 1277 (19 Apr) | 19 | 3 | 17 Apr | 19 Apr | ||||
| 54. | Common Tern | 0 | 265 | 0 | 265 | 124 | 141 | 206 (10 Apr) | 38 | 6 | 7 Apr | 18 Apr | ||||
| 55. | Sandwich Tern | 0 | 4189 | 0 | 4189 | 1223 | 2966 | 1877 (19 Apr) | 31 | 5 | 5 Apr | 19 Apr | ||||
| 56. | Little Gull | 1 | 372 | 12 | 385 | 1 | 384 | 212 (23 Apr) | 50 | 8 | 14 Mar | 9 May | ||||
| 57. | Black-headed Gull | 24 | 417 | 34 | 475 | 72 | 403 | 184 (23 Apr) | 88 | 14 | 14 Mar | 21 May | ||||
| 58. | Caspian Gull | 0 | 3 | 0 | 3 | 1 | 2 | 1 ( 7 Apr) | 19 | 3 | 7 Apr | 16 Apr | ||||
| 59. | Yellow-legged Gull | 0 | 1 | 0 | 1 | 0 | 1 | 1 (18 Apr) | 6 | 1 | 18 Apr | 18 Apr | ||||
| 60. | Great Black-backed Gull | 0 | 48 | 5 | 53 | 4 | 49 | 11 ( 7 Apr) | 75 | 12 | 5 Apr | 9 May | ||||
| Species | Mar | Apr | May | Totals | SW | NE | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 61. | Arctic Skua | 0 | 2 | 1 | 3 | 0 | 3 | 1 ( 7 Apr) | 19 | 3 | 7 Apr | 9 May | ||||
| 62. | Razorbill | 1 | 0 | 0 | 1 | 1 | 0 | 1 (14 Mar) | 6 | 1 | 14 Mar | 14 Mar | ||||
| 63. | Razorbill/Guillemot | 0 | 1 | 0 | 1 | 1 | 0 | 1 (11 Apr) | 6 | 1 | 11 Apr | 11 Apr | ||||
| 64. | Red-throated Diver | 1 | 64 | 3 | 68 | 0 | 68 | 19 (11 Apr) | 69 | 11 | 14 Mar | 9 May | ||||
| 65. | Black-throated Diver | 0 | 21 | 0 | 21 | 0 | 21 | 7 (11 Apr) | 25 | 4 | 11 Apr | 23 Apr | ||||
| 66. | diver sp. | 0 | 25 | 0 | 25 | 0 | 25 | 22 ( 7 Apr) | 19 | 3 | 5 Apr | 10 Apr | ||||
| 67. | White Stork | 0 | 3 | 4 | 7 | 1 | 6 | 4 ( 9 May) | 25 | 4 | 17 Apr | 9 May | ||||
| 68. | Gannet | 4 | 36 | 19 | 59 | 4 | 55 | 19 (19 Apr) | 69 | 11 | 14 Mar | 21 May | ||||
| 69. | Spoonbill | 0 | 5 | 0 | 5 | 0 | 5 | 2 ( 7 Apr) | 25 | 4 | 7 Apr | 19 Apr | ||||
| 70. | Little Egret | 0 | 1 | 0 | 1 | 0 | 1 | 1 (23 Apr) | 6 | 1 | 23 Apr | 23 Apr | ||||
| 71. | Great White Egret | 0 | 10 | 2 | 12 | 0 | 12 | 4 (23 Apr) | 31 | 5 | 5 Apr | 9 May | ||||
| 72. | Grey Heron | 1 | 35 | 8 | 44 | 6 | 38 | 14 (23 Apr) | 75 | 12 | 14 Mar | 21 May | ||||
| 73. | Osprey | 0 | 2 | 0 | 2 | 0 | 2 | 1 (22 Apr) | 13 | 2 | 22 Apr | 23 Apr | ||||
| 74. | Sparrowhawk | 2 | 5 | 2 | 9 | 0 | 9 | 2 (14 Mar) | 44 | 7 | 14 Mar | 9 May | ||||
| 75. | Goshawk | 0 | 1 | 0 | 1 | 0 | 1 | 1 (23 Apr) | 6 | 1 | 23 Apr | 23 Apr | ||||
| 76. | Marsh Harrier | 2 | 25 | 7 | 34 | 2 | 32 | 11 (23 Apr) | 75 | 12 | 14 Mar | 9 May | ||||
| 77. | Hen Harrier | 0 | 4 | 0 | 4 | 0 | 4 | 2 (11 Apr) | 19 | 3 | 11 Apr | 23 Apr | ||||
| 78. | Hen/Montagu's/Pallid Harrier | 0 | 0 | 1 | 1 | 0 | 1 | 1 ( 9 May) | 6 | 1 | 9 May | 9 May | ||||
| 79. | Black Kite | 0 | 1 | 0 | 1 | 0 | 1 | 1 (23 Apr) | 6 | 1 | 23 Apr | 23 Apr | ||||
| 80. | Common Buzzard | 2 | 23 | 4 | 29 | 3 | 26 | 8 (23 Apr) | 44 | 7 | 14 Mar | 9 May | ||||
| 81. | Short-eared Owl | 0 | 1 | 0 | 1 | 1 | 0 | 1 (11 Apr) | 6 | 1 | 11 Apr | 11 Apr | ||||
| 82. | Great Spotted Woodpecker | 0 | 3 | 0 | 3 | 1 | 2 | 2 (11 Apr) | 13 | 2 | 5 Apr | 11 Apr | ||||
| 83. | Kestrel | 2 | 33 | 1 | 36 | 2 | 34 | 17 (23 Apr) | 56 | 9 | 14 Mar | 5 May | ||||
| 84. | Merlin | 0 | 2 | 2 | 4 | 0 | 4 | 2 (23 Apr) | 19 | 3 | 23 Apr | 9 May | ||||
| 85. | Hobby | 0 | 1 | 0 | 1 | 0 | 1 | 1 (23 Apr) | 6 | 1 | 23 Apr | 23 Apr | ||||
| 86. | Peregrine | 1 | 5 | 1 | 7 | 4 | 3 | 2 (11 Apr) | 38 | 6 | 14 Mar | 9 May | ||||
| 87. | Jay | 0 | 0 | 3 | 3 | 2 | 1 | 2 ( 4 May) | 13 | 2 | 4 May | 9 May | ||||
| 88. | Magpie | 0 | 4 | 4 | 8 | 1 | 7 | 3 (23 Apr) | 31 | 5 | 5 Apr | 21 May | ||||
| 89. | Jackdaw | 0 | 1 | 0 | 1 | 1 | 0 | 1 ( 5 Apr) | 6 | 1 | 5 Apr | 5 Apr | ||||
| 90. | Carrion Crow | 0 | 10 | 3 | 13 | 0 | 13 | 5 (18 Apr) | 25 | 4 | 10 Apr | 6 May | ||||
| Species | Mar | Apr | May | Totals | SW | NE | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 91. | Great Tit | 0 | 4 | 1 | 5 | 0 | 5 | 4 (23 Apr) | 13 | 2 | 23 Apr | 9 May | ||||
| 92. | Wood Lark | 0 | 7 | 0 | 7 | 0 | 7 | 3 (16 Apr) | 25 | 4 | 10 Apr | 19 Apr | ||||
| 93. | Skylark | 2 | 9 | 1 | 12 | 0 | 12 | 3 (11 Apr) | 50 | 8 | 14 Mar | 4 May | ||||
| 94. | Sand Martin | 0 | 262 | 41 | 303 | 14 | 289 | 170 (23 Apr) | 81 | 13 | 7 Apr | 9 May | ||||
| 95. | Swallow | 0 | 652 | 266 | 918 | 69 | 849 | 439 (23 Apr) | 88 | 14 | 7 Apr | 21 May | ||||
| 96. | House Martin | 0 | 17 | 14 | 31 | 1 | 30 | 8 ( 6 May) | 56 | 9 | 7 Apr | 21 May | ||||
| 97. | Willow Warbler | 0 | 1 | 0 | 1 | 0 | 1 | 1 (23 Apr) | 6 | 1 | 23 Apr | 23 Apr | ||||
| 98. | Lesser Whitethroat | 0 | 0 | 2 | 2 | 0 | 2 | 2 ( 4 May) | 6 | 1 | 4 May | 4 May | ||||
| 99. | Starling | 104 | 138 | 22 | 264 | 20 | 244 | 104 (14 Mar) | 88 | 14 | 14 Mar | 9 May | ||||
| 100. | Song Thrush | 4 | 50 | 0 | 54 | 3 | 51 | 15 (11 Apr) | 50 | 8 | 14 Mar | 23 Apr | ||||
| 101. | Redwing | 0 | 12 | 0 | 12 | 4 | 8 | 7 (11 Apr) | 25 | 4 | 7 Apr | 16 Apr | ||||
| 102. | Fieldfare | 0 | 8 | 0 | 8 | 0 | 8 | 6 ( 7 Apr) | 13 | 2 | 7 Apr | 11 Apr | ||||
| 103. | Ring Ouzel | 0 | 18 | 2 | 20 | 0 | 20 | 4 (17 Apr) | 50 | 8 | 7 Apr | 9 May | ||||
| 104. | Wheatear | 0 | 1 | 1 | 2 | 0 | 2 | 1 (17 Apr) | 13 | 2 | 17 Apr | 4 May | ||||
| 105. | Tree Sparrow | 0 | 0 | 1 | 1 | 0 | 1 | 1 ( 4 May) | 6 | 1 | 4 May | 4 May | ||||
| 106. | House Sparrow | 0 | 0 | 1 | 1 | 0 | 1 | 1 ( 4 May) | 6 | 1 | 4 May | 4 May | ||||
| 107. | Dunnock | 0 | 8 | 2 | 10 | 0 | 10 | 3 (10 Apr) | 38 | 6 | 5 Apr | 9 May | ||||
| 108. | Blue-headed Wagtail | 0 | 9 | 3 | 12 | 2 | 10 | 5 (23 Apr) | 38 | 6 | 11 Apr | 9 May | ||||
| 109. | Yellow Wagtail (flavissima) | 0 | 12 | 9 | 21 | 1 | 20 | 9 (23 Apr) | 31 | 5 | 11 Apr | 9 May | ||||
| 110. | Grey-headed Wagtail | 0 | 5 | 3 | 8 | 0 | 8 | 5 (23 Apr) | 19 | 3 | 23 Apr | 9 May | ||||
| 111. | Yellow wagtail sp. | 0 | 89 | 22 | 111 | 11 | 100 | 53 (23 Apr) | 75 | 12 | 10 Apr | 9 May | ||||
| 112. | White Wagtail | 0 | 14 | 3 | 17 | 5 | 12 | 4 (23 Apr) | 56 | 9 | 11 Apr | 9 May | ||||
| 113. | alba wagtail sp. | 21 | 113 | 11 | 145 | 19 | 126 | 24 (11 Apr) | 94 | 15 | 14 Mar | 21 May | ||||
| 114. | Pied Wagtail | 0 | 3 | 0 | 3 | 0 | 3 | 1 ( 7 Apr) | 19 | 3 | 7 Apr | 22 Apr | ||||
| 115. | Meadow Pipit | 10 | 2127 | 27 | 2164 | 11 | 2153 | 764 (22 Apr) | 88 | 14 | 14 Mar | 9 May | ||||
| 116. | Tree Pipit | 0 | 235 | 73 | 308 | 5 | 303 | 126 (23 Apr) | 81 | 13 | 7 Apr | 21 May | ||||
| 117. | Chaffinch | 1 | 27 | 3 | 31 | 6 | 25 | 9 (11 Apr) | 50 | 8 | 14 Mar | 21 May | ||||
| 118. | Brambling | 0 | 9 | 0 | 9 | 0 | 9 | 4 ( 7 Apr) | 25 | 4 | 5 Apr | 23 Apr | ||||
| 119. | finch sp. | 0 | 0 | 2 | 2 | 0 | 2 | 2 (21 May) | 6 | 1 | 21 May | 21 May | ||||
| 120. | Hawfinch | 0 | 1 | 2 | 3 | 3 | 0 | 2 (21 May) | 13 | 2 | 16 Apr | 21 May | ||||
| Species | Mar | Apr | May | Totals | SW | NE | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 121. | Greenfinch | 0 | 19 | 19 | 38 | 9 | 29 | 14 ( 9 May) | 81 | 13 | 5 Apr | 21 May | ||||
| 122. | Linnet | 1 | 446 | 57 | 504 | 10 | 494 | 94 (10 Apr) | 100 | 16 | 14 Mar | 21 May | ||||
| 123. | Mealy Redpoll | 0 | 1 | 0 | 1 | 0 | 1 | 1 (23 Apr) | 6 | 1 | 23 Apr | 23 Apr | ||||
| 124. | redpoll sp. | 0 | 4 | 3 | 7 | 3 | 4 | 3 (17 Apr) | 25 | 4 | 17 Apr | 9 May | ||||
| 125. | Goldfinch | 0 | 54 | 12 | 66 | 13 | 53 | 15 (11 Apr) | 69 | 11 | 5 Apr | 9 May | ||||
| 126. | Siskin | 0 | 2 | 0 | 2 | 0 | 2 | 1 (11 Apr) | 13 | 2 | 11 Apr | 23 Apr | ||||
| 127. | Reed Bunting | 3 | 20 | 13 | 36 | 1 | 35 | 5 (23 Apr) | 75 | 12 | 14 Mar | 9 May | ||||
| Other species | ||||||||||||||||
| Species | Mar | Apr | May | Totals | SW | NE | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 1. | Harbour Porpoise | 0 | 2 | 0 | 2 | 0 | 2 | 2 (10 Apr) | 6 | 1 | 10 Apr | 10 Apr | ||||
| Other species | ||||||||||||||||
| Species | Mar | Apr | May | Totals | SW | NE | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 1. | Bumblebee sp. | 0 | 3 | 0 | 3 | 0 | 3 | 3 ( 7 Apr) | 6 | 1 | 7 Apr | 7 Apr | ||||
| Species | Mar | Apr | May | Totals | SW | NE | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| Totals | 408 | 19146 | 1912 | 21466 | 5664 | 15802 | 100 | 16 | ||||||||
| Observation hours | 2:20 | 49:15 | 15:15 | 66:50 | ||||||||||||
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