It is a Tern
Any of various sea birds of the genus Sterna and related genera, related to and resembling the gulls but characteristically smaller and having a forked tail.
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Koala is an animal that is four letters long and ends with "oa."
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Duty has four letters and starts with a D, and ends with a Y.
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An animal having four feet is a quadruped which means four-footed or having four feet.