female; mottled head; white underparts; dark above (Zoo; 2008-10-21)

Knob-billed Duck
Sarkidiornis melanotos

Native Range: Africa and Oriental Region

Notes: the male during the breeding season develops a large knob at the base of his bill, and this protuberance gives the species its name; nests in tree cavities; found along rivers and lakes in woodlands.

hen; note the green patch on the wing (Zoo; 2012-09-19)

drake posing for a head portrait; note the knobbed bill (Zoo; 2012-09-19)