Animals are interesting creatures. Sometimes they do what you expect, other times not so much. There are many that strike up unusual friendships with each other, relationships you would never expect. Why they do this, we may never know, but perhaps like humans, they crave companionship in whatever form. From the barn owl and his feline friend, to the pregnant canine and a baby monkey, here are 15 Unbelievable Animals Who Adopted Other Animals!