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- Episode 1 Birding Basics: Bird Origins and Taxonomy
- Episode 2 Basic Bird Anatomy
- Episode 3 Size, Shape, and Color as Birding Tools
- Episode 4 Bird Distribution, Status, and Endemism
- Episode 5 Habitat and Season as Birding Tools
- Episode 6 Introduction to Birding Optics
- Episode 7 Tactics for Better Birding
- Episode 8 Using Bird Behavior to Identify Birds
- Episode 9 Understanding Variations in Plumage
- Episode 10 Birding by Ear
- Episode 11 Essentials of Bird Migrations
- Episode 12 Birding at Night
- Episode 13 Pelagic Birds
- Episode 14 Waterbirds, Shorebirds, and Game Birds
- Episode 15 Diurnal Raptors
- Episode 16 From Doves to Kingfishers
- Episode 17 Passerines: From Flycatchers to Thrushes
- Episode 18 Passerines: From Thrashers to Warblers
- Episode 19 Passerines: From Tanagers to Birders
- Episode 20 Photography for Birders
- Episode 21 Birding Sites in Eastern North America
- Episode 22 Birding Sites in Western North America
- Episode 23 Birds and People
- Episode 24 Birding Ethics and Conservation
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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.
Genre: Documentary
Cast: James Currie
Crew: James Currie (Writer)
Country: United States of America
Studio: Wonderium, The Great Courses
Runtime: 30:14 minutes
Quality: HD
First Air Date: May 26, 2017
Last Air date: May 26, 2017
Episode: 24 Episode
Season: 1 Season
IMDb: 10
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