Wolf
Their winter fur is highly resistant to the cold. Wolves in northern climates can rest comfortably in open areas at  by placing their muzzles between the rear legs and covering their faces with their tail. Wolf fur provides better insulation than dog fur, and does not collect ice when warm breath is condensed against it. Since about 1930, the skull of many Arctic wolves has become smaller. This might be because of hybridization between wolves and dogs. They are  tall when they're adults. Adult arctic wolves weigh about . Arctic wolves live in a group of 7-20 wolves. They may live up to 5–10 years in the wild. They can live for 14 years if they are well cared for in a zoo.