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BirdSource: Birding with a Purpose
This site allows birders to record their observations in order to assist ornithologists "define bird ranges, populations, migration pathways, and habitat needs." The data from the National Audubon Society's Christmas Bird Count is available for the past 100 years. There are also articles about other counts and various species and color photos and sounds for many birds.
http://www.birdsource.org/
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