1 الموسم
24 حلقة
The National Geographic Guide to Birding in North America - Season 1 Episode 9 الحلقة 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.
- عام: 2017
- بلد: United States of America
- النوع: Documentary
- ستوديو: Wonderium, The Great Courses
- الكلمة الرئيسية: natural history, birding, educational, guide, science
- مخرج: James Currie
- المصبوب: James Currie