pigs

A stray wild boar cub captured by farmers gets civilized in a hogpen with pigs in Lantian County of Shaanxi Province, China

a capybara carries a squirrel monkey

A capybara - one of the world's largest rodents - carries a squirrel monkey on its back at Tobu Zoo

Knock knock knock

friendly

Somehow that dog looks a lot more ferocious than the actual wild animal in the relationship

adopted cub

Bessi and her adopted cub

motherly (next)

Alsatian dog Mao Mao acts as a surrogate mother to five tigons, nursing the new-borns at Wuqiao Acrobatics Performance Zoo, Hebei province, China

motherly

They may naturally be enemies but that didn't stop this motherly dog from adopting an unusual little one - a kitten