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Have you ever heard of a marsh hawk or a sparrow hawk? These long-familiar bird names have passed into history. The study of birds, like any science, remains a work in progress. New findings about birds' DNA or other attributes bring changes in classification of species, often resulting in new names. Check a field guide, and you'll now find them as the Northern Harrier and the American Kestrel. Join your local Audubon and take a field trip to see what you can see!