02/14/2012 12:04 pm ET Updated Feb 14, 2012

Animal Friendships That May Surprise You (PHOTOS)

Who said animals don't need friends too?

A recent book from National Geographic magazine writer Jennifer S. Holland examines some of the most unlikely, and heartwarming, friendships in the animal kingdom.

"Unlikely Friendships: 47 Remarkable Stories from the Animal Kingdom," features images of friendships between animals as disparate as goats and hippos, monkeys and doves and even lizards and cats.

They may be a little unusual, but interspecific friendships occur more often than you might expect. Check out this video of a great dane and a deer hanging out or these friends who happen to be an owl and a cat.

Click here for even more videos of animal friends.

Check out some of the most unlikely animal friendships below, ranging from the adorable to the bizarre. To see more unlikely animal buddies, vist the book's Tumblr page.

Images courtesy of Workman Publishing and credited photographers.

Unlikely Animal Friendships