1 Tymor
24 Pennod
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.
- Blwyddyn: 2017
- Gwlad: United States of America
- Genre: Documentary
- Stiwdio: Wonderium, The Great Courses
- Allweddair: natural history, birding, educational, guide, science
- Cyfarwyddwr: James Currie
- Cast: James Currie