Editing Canvasback (section)

==Breeding==
The breeding habitat of the canvasback is in [[North America]]n [[prairie pothole]]s. The bulky nest is built from vegetation in a [[marsh]] and lined with [[Down feather|down]]. Loss of nesting habitat has caused populations to decline. The canvasback usually takes a new mate each year, pairing in late winter on ocean bays.<ref name=aab/> It prefers to nest over water on permanent prairie marshes surrounded by emergent vegetation, such as [[Typha|cattails]] and [[Schoenoplectus|bulrushes]], which provide protective cover. Other important breeding areas are the [[subarctic]] river deltas in [[Saskatchewan]] and the interior of [[Alaska]].<ref name="DUCB"/>

It has a clutch size of approximately 5–11&nbsp;eggs, which are greenish drab. The chicks are covered in down at hatching and able to leave the nest soon after.<ref name="aab"/> The canvasback sometimes lays its eggs in other canvasback nests and [[Redhead (duck)|redheads]] often [[Brood parasite|parasitize]] canvasback nests.<ref name="DUCB"/>
[[File:Canvasaback (Aythya valisineria) RWD2.jpg|thumb|left|Drake canvasback stretching wings]]