The Crossley ID Guide: Waterfowl–A Book Review
10,000 Birds
NOVEMBER 7, 2017
This is how, I think, the “Crossley technique” works best—coverage of specific bird families that pose identification challenges to birders at all levels of skill. And Hybrids: Waterfowl tend to hybridize to a greater degree than most other bird families, and the guide does an excellent job of covering hybrids.
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