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Behavior

Behavior generally refers to the actions or reactions of an object or organism, usually in relation to the environment or surrounding world of stimuli. Behavior can be conscious or unconscious, overt[?] or covert[?], and voluntary[?] or involuntary[?].

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List of birds

... they form the Paleognathae (or 'old jaws'), one of the two evolutionary "super orders". Struthioniformes (mainly Southern hemisphere; 12 species, 2 extinct.) ...