I photographed this female Purple Martin on 13 June 2016, at Lake Byllesby Regional Park, Dakota County, Minnesota. Martins in Canada and the northern United States have a lot going against them. They depend on flying insects. Cold weather kills their insect prey, which, in turn, can wipe out local martin populations. By out-competing nesting martins, introduced starlings and House Sparrows can also wipe out these swallows.