Rohwer et al. 2002).
Although males do not help with incubation or care of the young, in the spring they vigorously defend territories picked by the females. In the summer, males molt earlier than the females, and afterward head south without their mates and, by mid-August, arrive at their Gulf Coast wintering areas. This pair of Blue-winged Teal fed in a small pond near the Old Highway 77 Bridge in the Minnesota Valley National Wildlife Refuge near Minneapolis. I was surprised by the male's iridescent purple head coloration.