Passeriform, (order passeriformes), any member of the largest order of birds and the dominant avian group on earth today. A passerine or passeriform is a member of the order passeriformes, the largest order of birds, containing more than half of all species. Passerines, also known as perching birds or songbirds, are a large and incredibly diverse order of birds, passeriformes, that make up more than half.
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A passerine (/ p s ra n /) is any bird of the order passeriformes (/ p s r f rmi z /;