| Species | Date | Count | Location | Observer | Checklist |
|---|---|---|---|---|---|
| Arctic Skua Stercorarius parasiticus | 27th Apr 2025 6:56 a.m. | 1 | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Hugo Blanco | |
| Great Skua Stercorarius skua | 27th Apr 2025 6:56 a.m. | 3 | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Jaime Pires | |
| Atlantic Puffin Fratercula arctica | 27th Apr 2025 6:56 a.m. | 1 | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Jaime Pires | |
| Sabine's Gull Xema sabini | 27th Apr 2025 6:56 a.m. | 14 | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Giuseppe Vecchio | |
| Yellow-legged Gull Larus michahellis | 27th Apr 2025 6:56 a.m. | X | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Hugo Blanco | |
| Lesser Black-backed Gull Larus fuscus | 27th Apr 2025 6:56 a.m. | X | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Patrik Blomquist | |
| Black Tern Chlidonias niger | 27th Apr 2025 6:56 a.m. | 29 | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Vsevolod Rudyi | |
| Arctic Tern Sterna paradisaea | 27th Apr 2025 6:56 a.m. | 1 | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Hugo Blanco | |
| Common Tern Sterna hirundo | 27th Apr 2025 6:56 a.m. | 28 | Mar dos Ursos--saída pelágicas Sintra, Lisboa | M Sá & J Teixeira | |
| Sandwich Tern Thalasseus sandvicensis | 27th Apr 2025 6:56 a.m. | 7 | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Vsevolod Rudyi | |
| Wilson's Storm-Petrel Oceanites oceanicus | 27th Apr 2025 6:56 a.m. | 1 | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Giuseppe Vecchio | |
| European Storm-Petrel Hydrobates pelagicus | 27th Apr 2025 6:56 a.m. | 50 | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Jaime Pires | |
| Cory's Shearwater Calonectris borealis | 27th Apr 2025 6:56 a.m. | 6 | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Luís Custódia | |
| Northern Gannet Morus bassanus | 27th Apr 2025 6:56 a.m. | 5 | Mar dos Ursos--saída pelágicas Sintra, Lisboa | Nelson Pereira |
1, Arctic Skua(Stercorarius parasiticus)
3, Great Skua(Stercorarius skua)
1, Atlantic Puffin(Fratercula arctica)
14, Sabine's Gull(Xema sabini)
X, Yellow-legged Gull(Larus michahellis)
X, Lesser Black-backed Gull(Larus fuscus)
29, Black Tern(Chlidonias niger)
1, Arctic Tern(Sterna paradisaea)
28, Common Tern(Sterna hirundo)
7, Sandwich Tern(Thalasseus sandvicensis)
1, Wilson's Storm-Petrel(Oceanites oceanicus)
50, European Storm-Petrel(Hydrobates pelagicus)
6, Cory's Shearwater(Calonectris borealis)
5, Northern Gannet(Morus bassanus)