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Vagrancy in Birds: A Book Review

10,000 Birds

Less and Gilroy sort through the exogenous (external) and endogenous (internal) factors thought to cause vagrancy and the scientific experiments that have sought to prove their significance with patience and plain language as well as charts and photographs. It’s not always easy reading.

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Second Atlas of Breeding Birds in Pennsylvania: A Review by an Atlas Novice

10,000 Birds

This page also offers a table of the number of blocks for which there is possible, probably, and confirmed breeding in the first and second atlases, and, for some birds, a chart of Breeding Bird Survey Trend, based on 40 years of breeding bird survey data. Behind every distribution map, there must be a fascinating birding experience.