Comb Duck/ Knob-billed Duck Sarkidiornis melanotos

Comb Duck
Comb Duck male
The unusual Comb drake with comb. The Comb Duck has two subspecies: Sarkidiornis melanotos melanotos (above/immediately below) which has grey flanks and comes from sub-Saharan Africa and tropical Asia and Sarkidiornis melanotos sylvicola (further below) which has black flanks and comes from tropical South America.
Comb Duck
Comb Duck female
Comb duck (female doesn't have comb on bill).
Comb Duck male
Comb Duck
Some class the South American, dark-flanked duck as a separate species: the Knob-billed Duck.
In the sunlight the Comb Duck's plumage shows beautiful iridescence.
Putting tongue out