Answer: c) 54. About 54 warbler species nest in North America. Most of these birds belong to the family Parulidae and are restricted to the New World.
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Tips for Easy Bird Identification
Identifying birds is at the very heart of bird watching. Each bird encountered is like a little puzzle or mystery to solve, because, while birds of a single species all share a certain set of physical traits, no two individual birds, like no two individual humans, are exactly alike.