© iStock

Rabbit and chick - A sweet bunny kiss.

© iStock

Monkey and lion/tiger cubs - These friends take a quick break from a rigorous bout of play.

© Reuters

Horse and dog - Keeping watch from the barn.

© iStock

Dog and rabbit - This bunny has a big sister to watch over him.

© iStock

Cow and pig - Just another day on the farm.

© iStock

Cat and lion cub - They may be the same size now, but one day the cub will tower over the cat.

© Reuters

Mouse and toad - A smart mouse hitches a ride.

© Reuters

Monkey and goat - If goatback riding were a sport, this monkey would be a pro.

© Reuters

Kitten and puppy - These two will grow up to be the best of friends.

© Reuters

Pig and tiger - A tiger befriends a very lucky piglet.

© Reuters

Squirrel monkey and capibara - The perfect resting place for a tired monkey.

© Reuters

Donkey and wolf - Although naturally prey to the powerful predator, this donkey became the wolf's best friend.

© Reuters

Deer and ram - A cross-species wedding ceremony at Yunnan Wild Animal Park, China.

© Reuters

Dog and buffalo - This dog finds a comfy spot to hang out on his buffalo friend.

© Reuters

Cat and mouse - Two enemy species form an unexpected friendship. 

© Reuters

Turtle and crocodile - This turtle takes advantage of his crocodile friend to cross a rushing river.

© Reuters

Monkey and parrot - A thoughtful monkey grooms a parrot covered in lice.

© Reuters

Dog and tiger/cougar cubs - These cubs' adoptive mother gives them a proper grooming.

© Reuters

Hippopotamus and tortoise - A curious hippo baby encourages his tortoise friend.

© Reuters

Dog and tiger cubs - This mama dog teaches her adopted babies good manners as they play.

© Reuters

Dog and tiger cub - She definitely has a mama's boy.

© Reuters

Dog, puppy, and tiger cubs - This dog happily feeds her mixed-species litter.

© Reuters

Cow and cat - A cat pays a visit to her cow friends as they wait to be milked.

© Reuters

Dog and tiger - These two animals live peacefully together at the Circus William in Berlin, Germany.

© Reuters

Dog, puppy, and tiger cub - Another caring mother takes in an orphaned cub.

© Reuters

Crocodile and butterfly - This crocodile sits patiently as his butterfly friend comes to visit.

© Shutterstock

Rabbit and dog - This dog keeps a watchful eye out for danger in the meadow.

© Shutterstock

Pony and dog - Silly friends put on a show for their family.

© Shutterstock

Lion and bear - Lions and tigers and bears, oh my!

© Shutterstock

Tortoise and rabbit - A cheeky tortoise steals his friend's food.

© Shutterstock

Rabbit, guinea pig, and dog - The happy trio pose for a family photo.

© Shutterstock

Goats and dogs - The family dogs meet their new siblings.

© Shutterstock

Crow and water buffalo - This buffalo's feathered friend is not a fan of getting his feet wet.

© Reuters

Cat and boar - A game of follow the leader.

© iStock

Iguana and manta ray -

Would you ever believe that these two very different species could form a friendship?

See also: These baby animals look nothing like their parents.

© Reuters