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Due to its geographical location, the Azores is the Portuguese region with the highest frequency of occasional seabirds recorded. Among the most frequent are the Black-browed Albatross Thalassarche melanophris, the Bermuda petrel Pterodroma cahow, the Black-capped petrel Pterodroma hasitata, the White-tailed tropicbird Phaethon lepturus (Order Pelecaniformes), Forster's tern Sterna forsteri and Bridled tern Onychprion anaethetus .

Generally, these occasional birds are diverted from their usual migratory route due to adverse weather conditions.

Although rare, Great skua Catharacta skua and Northern gannet Morus bassanus have also been sighted in the waters around the archipelago.

Ocasionais: Causas
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