Immature male (formative/1st alternate)
Bird Identification Guide Sébastien Reeber
Wildfowl of Europe, Asia and North America
Waterfowl of North America, Europe & Asia
Blue-winged Teal Anas discors
Adult male (def. basic/def. alternate)
Adult female (def. basic/def. alternate)
Immature female (formative/1st alternate)
Juvenile (1st basic)
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