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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.
- Yil: 2017
- Mamlakat: United States of America
- Janr: Documentary
- Studiya: Wonderium, The Great Courses
- Kalit so'z: natural history, birding, educational, guide, science
- Direktor: James Currie
- Cast: James Currie