A dabbling duck, gadwalls typically feed by tipping forward to reach underwater for plants. However, they are also known to steal food from coots or other diving birds. This medium-sized gray duck is an infrequent winter visitor in Hawaii. Males are predominately gray with a black rump and a small white wing patch in flight. Females are a mottled brown with a similar white patch on the wing, and an orange line along the edge of the bill.