In addition to the unusual geology, the area also offers some interesting habitat for wildlife. Small holes in the formations provide nesting cavities for our smallest falcon, the American kestrel. Pigeons also fly from ledge to ledge as they commonly do in most cities. Here we gain an understanding of this introduced bird's natural habitat in Europe and why they are also called rock doves. Pronghorns inhabit the surrounding shortgrass prairie. Although they are large mammals, their colors make them surprisingly difficult to see. Also in the area are coyotes, black-tailed jackrabbits, lesser earless lizards, and the venomous western rattlesnake. Birders find Cassin's sparrows, ferruginous hawks, and golden eagles of special interest. Common birds include horned larks, vesper sparrows, western meadowlarks, and black-billed magpies. Winter brings prairie falcons, rough-legged hawks, and large flocks of Lapland longspurs.