hen, as told by dark eye; brown head; dark bill and back (Zoo; 2008-09-18)

Ferruginous Duck
Aythya nyroca

Native Range: Eurasia

Notes: little sexual dimorphism; this diving duck that is chestnut-brown (drake) or darker brown (hen) in plumage all over, except for the bright white undertail coverts; frequents fresh or slow-moving brackish water fringed with vegetation.

small body; brown sides; short rounded tail (Zoo; 2008-09-18)

prominent white undertail coverts (Zoo; 2008-09-18)

hen, as best told by dark eye (Zoo; 2008-09-18)

drake, as best told by white eye (Zoo; 2008-09-18)