The federally endangered Iowa Pleistocene Snail (Discus macclintocki). This is a relict from the last ice age, some 400,000 years ago. It lives in cold air vents on 37 different hillsides in Iowa (and one in Illinois) and survives only in the cold air that blows past underground ice and out of the cracks in limestone cliffs.
A bobcat (Lynx rufus) traverses along the Mexican-Texas border. A border wall along the lower Rio Grande in Texas divides nations as well as habitats, hindering daily essential movements of animals in the area. Bobcats would normally cross the border to find mates or catch dinner. The wall also blocks the dailly rounds of ocelots, another member of the cat family. Photograph by Joel Sartore with Mitch Sternberg, Jennifer Lowry, and Naghma Malik, all U.S. Fish and Wildlife Service.