Definition: The term accidental refers to species that do not occur in a region under normal circumstances.
Source: Sibley, D.A. 2001. The Sibley Guide to Bird Life & Behavior. New York: Alfred A. Knopf.
By Laura Klappenbach, About.com Guide
Source: Sibley, D.A. 2001. The Sibley Guide to Bird Life & Behavior. New York: Alfred A. Knopf.
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