19 unlikely animals who became best friends

REUTERS/Stringer

It's not unheard of for animals to become quite chummy with members of another species - even with those they would normally consider eating.

Abandonment, trauma, or living together on farms or zoos, all serve as factors in bringing animals together in unexpected ways.

In celebration of National Best Friends Day, we're taking a look at what happens when opposites attract.

Robert Ferris wrote the original version of this post.