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Bird anatomy / Feathers / Birds / Plumage / Flight feather / Bird / Common murre / Biota / Birds of North America / Humphrey-Parkes terminology / Teleostomi


This article started out as a bit of an argument. Jerry Liguori and Brian Sullivan, in a previous article in Birding, presented evidence against the conventional wisdom that gray Northern Harriers are necessarily older m
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Document Date: 2015-02-27 22:35:08


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File Size: 1,21 MB

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