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Although very little is known about wintering seabirds in the waters of the Azorean EEZ, species such as the Ring-billed gull Larus delawarensis, the Laughing gull Larus atricilla, the Herring gull Larus argentatus, the Black-headed gull Chroicocephalus ridibundus, the Great black-backed gull Larus marinus, the Glaucous gull Larus hyperboreus and the Sandwich tern Thalasseus sandvicensis have been regularly observed, especially in marinas and ports in the archipelago.

Invernantes: Causas
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