Also present
Totals Maasvlakte II 2025
| Species | Apr | May | Jun | Jul | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| 1. | Dark-bellied Brent Goose | 9 | 0 | 0 | 0 | 9 | 9 | 0 | 9 (23 Apr) | 50 | 1 | 23 Apr | 23 Apr | ||||
| 2. | Greylag Goose | 2 | 0 | 0 | 0 | 2 | 0 | 2 | 2 (23 Apr) | 50 | 1 | 23 Apr | 23 Apr | ||||
| 3. | Egyptian Goose | 5 | 0 | 0 | 0 | 5 | 0 | 5 | 5 (23 Apr) | 50 | 1 | 23 Apr | 23 Apr | ||||
| 4. | Common Scoter | 10 | 0 | 0 | 0 | 10 | 0 | 10 | 10 (23 Apr) | 50 | 1 | 23 Apr | 23 Apr | ||||
| 5. | Great Crested Grebe | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 1 ( 7 Jul) | 50 | 1 | 7 Jul | 7 Jul | ||||
| 6. | Oystercatcher | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 1 ( 7 Jul) | 50 | 1 | 7 Jul | 7 Jul | ||||
| 7. | Whimbrel | 11 | 0 | 0 | 0 | 11 | 0 | 11 | 11 (23 Apr) | 50 | 1 | 23 Apr | 23 Apr | ||||
| 8. | Arctic Tern | 2 | 0 | 0 | 0 | 2 | 0 | 2 | 2 (23 Apr) | 50 | 1 | 23 Apr | 23 Apr | ||||
| 9. | Common/Arctic Tern | 263 | 0 | 0 | 69 | 332 | 83 | 249 | 263 (23 Apr) | 100 | 2 | 23 Apr | 7 Jul | ||||
| 10. | Sandwich Tern | 365 | 0 | 0 | 39 | 404 | 50 | 354 | 365 (23 Apr) | 100 | 2 | 23 Apr | 7 Jul | ||||
| 11. | Little Gull | 21 | 0 | 0 | 0 | 21 | 0 | 21 | 21 (23 Apr) | 50 | 1 | 23 Apr | 23 Apr | ||||
| 12. | Black-headed Gull | 0 | 0 | 0 | 4 | 4 | 2 | 2 | 4 ( 7 Jul) | 50 | 1 | 7 Jul | 7 Jul | ||||
| 13. | Common Gull | 3 | 0 | 0 | 9 | 12 | 9 | 3 | 9 ( 7 Jul) | 100 | 2 | 23 Apr | 7 Jul | ||||
| 14. | Herring Gull | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 ( 7 Jul) | 50 | 1 | 7 Jul | 7 Jul | ||||
| 15. | Lesser Black-backed Gull | 52 | 0 | 0 | 8 | 60 | 3 | 57 | 52 (23 Apr) | 100 | 2 | 23 Apr | 7 Jul | ||||
| 16. | large gull sp. | 0 | 0 | 0 | 500 | 500 | 0 | 500 | 500 ( 7 Jul) | 50 | 1 | 7 Jul | 7 Jul | ||||
| 17. | Gannet | 0 | 0 | 0 | 2 | 2 | 1 | 1 | 2 ( 7 Jul) | 50 | 1 | 7 Jul | 7 Jul | ||||
| 18. | Cormorant | 2 | 0 | 0 | 60 | 62 | 9 | 53 | 60 ( 7 Jul) | 100 | 2 | 23 Apr | 7 Jul | ||||
| 19. | Swallow | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 1 (23 Apr) | 50 | 1 | 23 Apr | 23 Apr | ||||
| 20. | Blue-headed Wagtail | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 1 (23 Apr) | 50 | 1 | 23 Apr | 23 Apr | ||||
| Species | Apr | May | Jun | Jul | Totals | S | N | Maximum | Presence (%) | Presence (days) | First | Last | |||||
| Totals | 747 | 0 | 0 | 694 | 1441 | 168 | 1273 | 100 | 2 | ||||||||
| Observation hours | 1:00 | 0:00 | 0:00 | 1:00 | 2:00 | ||||||||||||
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