The National Geographic Guide to Birding in North America - Season 1 Episode 9 Understanding Variations in Plumage

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  • Plumage variation in a single bird reveals much useful information. First, take account of plumage differences based on sex, and seasonal plumage changes. Then investigate the remarkable range of age-related plumage variation in birds. Learn how birds molt (shed and replace plumage), and how hybrid species, as well as genetic and environmental factors, pose challenges for identification.
The National Geographic Guide to Birding in North America
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