An orphaned monkey using a puppy as his jungle gym. A dog and a fawn lovingly grooming each other. A pit bull and a pig cuddling up for a nap. In the animal kingdom, there are unlikely relationships ...

Most animals build strong social bonds with their own kind, and researchers have found that the brain systems behind those connections are similar to the ones humans rely on in close relationships.

Add Yahoo as a preferred source to see more of our stories on Google. Parade Pets and Yahoo may earn commission from links in this article. There are cute animal friendships. And then there are animal ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. From clumsy puppies to grinning chimps, adorable animal content is ...

There are cute animal friendships. And then there are animal friendships so wholesome they make you feel like you accidentally wandered into the pages of a children's book. That's exactly what ...