About.Com has some very good information on it about Birds. Today I received a newsletter giving help identifying the different parts of the bird. They were using the Passerines. The “passerines are mostly small land birds and include many familiar types of species such as flycatchers, thrushes, sparrows, and warblers. They are sometimes called songbirds because many passerine species display complex vocal behaviors, and they are sometimes called perching birds because their enlarged flexible hind toe (the hallux) allows for perching on top of vegetation and other structures.” (About.Com)
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Passerine Identification