D’all up for a hike? Real-world cliffhangers, Dall sheep inhabit some of Alaska’s most rugged alpine areas. They thrive on the wind-swept exposed cliffs and peaks of mountains in central and northern Alaska. Dall sheep weigh an average of 130 pounds and have white fur. Their winter coats can be up to two inches thick, with coarse outer hairs covering a coat of fine wool. Rams have large horns that form a characteristic curl, while females, called ewes, have smaller horns. Photo by Sarah Dumont / NPS ALT TEXT: A white Dall sheep with large horns climbs up a steep cliff of a mountain that is covered in snow.