Editing Comb duck (section)

==Ecology==
It breeds in still [[freshwater]] [[swamp]]s and [[lake]]s in the [[tropics]]. It is largely resident, apart from dispersion in the wet season.<ref name = mb1987 />

This [[duck]] feeds on vegetation by grazing or dabbling<ref name = mb1987 /> and to a lesser extent on small fish, [[invertebrate]]s, and seeds. It can become a problem to rice farmers. Knob-billed ducks often perch in trees. They are typically seen in flocks, small in the wet season, up to 100 in the dry season. Sometimes they separate according to sex.<ref name = honoluluzoo/>

===Reproduction===
Comb ducks nest mainly in tree holes,<ref name = mb1987 /> also in tall grass. They line their nests with reeds, grass, or feathers, but not down.<ref name = honoluluzoo/>

Males may have two mates at once or up to five in succession. They defend the females and young, but not the nest sites. Unmated males perch in trees and wait for opportunities to mate.<ref name = honoluluzoo />

Females lay seven to 15<ref name = mb1987 /> yellowish-white eggs. Several females may lay in a single "dump nest" containing up to 50 eggs.<ref name = honoluluzoo />