outside the breeding season and tends to form only small flocks.

Gadwalls are monogamous and may start breeding after their first year. Pair formation begins during fall migration or on breeding grounds, but has also been reported to occur in August when males are still in eclipse plumage. Gadwalls are generally quiet, except during courtship. The male utters a mep call during a display known as the burp, where he raises his head pointing his bill towards a female. The grunt-whistle is similar to that of mallards, where the male rears