The National Geographic Guide to Birding in North America - Season 1 Episode 9
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.
- Жанр: Documentary
- Студыя: Wonderium, The Great Courses
- Ключавое слова: natural history, birding, educational, guide, science
- У ролях: James Currie
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