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The Sooty Tern is a bird species known for its dark plumage, which gives it a distinctive appearance compared to other terns. It belongs to the family Laridae and the genus Onychoprion. Adult Sooty Terns have a wingspan of around 80-95 cm and are characterized by their long, forked tails and slender, pointed wings. They are also recognized for their distinctive call, which is a loud, clear "keerrr" sound. Sooty Terns are seabirds that spend most of their lives at sea, only coming ashore to breed. They are highly migratory, with populations in the Atlantic and Pacific Oceans traveling long distances between their breeding and wintering grounds. They feed on fish and other marine life, which they catch by plunge-diving into the water from great heights. In terms of their place in the hierarchy, Sooty Terns belong to the larger category of Bird Species, which is a subcategory of Birds, which itself falls under the broader category of Animals. Within the Bird Species category, Sooty Terns are a type of Tern, which is a group of seabirds known for their graceful flight and distinctive calls. As such, the Sooty Tern occupies a specific niche within the bird world, characterized by its unique combination of physical traits, behaviors, and ecological roles.