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Interspecies love: The 30 most unlikely, adorable animal pairs

They say you can't choose your family. But these animals did.

John Drysdale. Promotional rights granted by Lisa Rogak.

16. The bulldog and her baby squirrels

Leslie Clews of Warwickshire, England, found three baby squirrels in his garden after a particularly nasty storm. He placed the bedraggled tots in the basket with the family bulldog, Susie, who had recently given birth and was preparing to send her puppies off into the world. The squirrel babies quite literally took over where Susie's pups left off.

John Drysdale. Promotional rights granted by Lisa Rogak.

17. The dog and her baby llama

Mahogany, a baby llama, was rejected by her mother, and Rosie, a mix between a pointer and a Rhodesian ridgeback, had just weaned a litter of her own. You could say they both had something the other wanted. Their shared owner, farmer Reg Bloom, introduced the pair in Brightlingsea, Essex, UK, and the rest is history. Though Mahogany is no longer nursing, she accompanies Rosie and the whole Bloom family on their evening walks, and the dog and the llama sleep together in the spare room off the kitchen.

John Drysdale. Promotional rights granted by Lisa Rogak.

18. The Chihuahua and his baby marmoset

When the baby marmoset's fellow marmosets turned on him at a small zoo near Thetford, Norfolk, England, the zookeepers called in Sam, the Chihuahua. Sam was meant to tolerate the baby marmoset clinging to him and to take the munchkin out for some much needed sunlight and exercise. Though the marmoset only weighed a few ounces, it was quite a load for Sam, who weighed in at just a few pounds himself.

Alex Coppel/Newspix/Rex/Rex USA. Promotional rights granted by Lisa Rogak.

19. The pig and his lamb

Edgar Alan Pig was lucky enough to be taken in by Pam Ahern in Victoria, Australia, who started a sanctuary for farm animals where they could live out their natural lives. Until Edgar passed away in 2010, he served as a welcome committee for hundreds of lambs, chickens, goats and other barnyard animals. He had a particularly special relationship with a little lamb named Arnie.

Richard Austin/Rex USA. Promotional rights granted by Lisa Rogak.

20. The Great Dane and his fawn

When a deathly ill, days-old fawn came to Secret World Wildlife Rescue center in Somerset, England, things weren't looking good. "She was wet, cold and almost unconscious," the center's founder, Pauline Kidner, told Rogak. Once the fawn, now named Cindy, began to recover, Kidner started bringing her outside, where her son's Great Dane, Rocky, quickly nosed Kidner out of the way and took it upon himself to father the fawn.

Bournemouth News / Rex Features. Promotional rights granted by Lisa Rogak.

21. The hen and her ducklings

When Hilda the hen started sitting on a nest of eggs in 2012, farmer Philip Palmer was looking forward to a new bunch of chicks. Boy did he get a surprise! Turns out Hilda was sitting on a bunch of Indian Runner ducks the whole time. Who knew? Not Palmer, and not the ducklings, who thanks to avian imprinting regarded the hen as their true mother from Day No. 1. Hilda for her part doesn't seem to know that her adopted children are ducks, either.

Tina Case/Rex Features. Promotional rights granted by Lisa Rogak.

22. The golden retriever and her bunnies

Koa, the golden retriever, found a nest of wild bunnies near where she lived in San Francisco. Koa's owners wound up taking the bunnies in after getting them checked out at the vet and Koa behaved as a mother to them. The bunnies "hop all over her and always find their way to the crook of her leg and find warmth and shelter," the animals' owner told Rogak.

Mike Hollist/Daily Mail/Rex USA. Promotional rights granted by Lisa Rogak.

23. The border collie and his Vietnamese pot-bellied piglets

Mac, a border collie, took to a group of four piglets as soon as they arrived at Blue Cross, one of the largest animal welfare nonprofits in the UK. Mac started licking and cuddling with the piglets, which started jumping all over Mac in return for the favor.

Reuters/Ali Jarekji. Promotional rights granted by Lisa Rogak.

24. The cat and her baby chicks

Nimra, a one-year-old mother cat, was tending to her litter of four kittens in Madaba, Jordan, when she adopted a flock of seven baby chicks that were suddenly orphaned in 2007. Nimra cared for everyone, kitten and chick alike, in the same cardboard box.

Northscot Press Agency/Rex USA. Promotional rights granted by Lisa Rogak.

25. The rabbit and her kittens

Melanie Humble agreed to foster a litter of abandoned, 5-week-old kittens in Aberdeen, Scotland. She thought her cat, Ellie, would chip in, but it turns out her rabbit Summer did instead. Summer and the kittens hit it off from the first moment they laid eyes on each other. She just sits there and lets them climb all over her, Humble told Rogak.

Jerry Daws/Rex US. Promotional rights granted by Lisa Rogak.

26. The cat and her Rottweiler puppies

Sky, a tortoiseshell cat, gave birth to four kittens and was nursing them beautifully when her owner introduced her to four Rottweiler puppies. The puppies had been rejected by their mother and were in pretty bad shape, but they took to Sky quickly, first nuzzling and then nursing. Soon, they were one big, happy family.

Richard Austin/Rex USA. Promotional rights granted by Lisa Rogak.

27. The dog and her lambs

A springer spaniel named Jess helps out with the feeding on a 180-acre sheep farm in Devon, UK. Her owner, Louise Moorhouse, says she doesn't know what she would do without her spaniel helper. “It’s like having an extra pair of hands,” she said. “I taught her to hold the milk bottle in her mouth and she did the rest.”

Nils Jorgensen/Rex US. Promotional rights granted by Lisa Rogak.

28. The cat and her squirrel

A family in West Sussex, UK, took in an abandoned squirrel, but the squirrel wouldn't drink from a bottle. So, the owners decided to slip her in between the kittens that had just been born to their two cats, Sugar and Spice. Each cat had had a litter, and there were a total of 10 kittens. So the squirrel, now called Chestnut, fit right in amid the chaos. Soon, she was suckling away and only left the group to forage for food.

Elaine Hu. Promotional rights granted by Lisa Rogak.

29. The Airedale terrier and her guinea pigs

Sunshade, the Airedale terrier, really liked guinea pigs. Whenever her owner took her to the pet store, she would park herself in front of the guinea pigs and just watch — but not in a hunt-y way, in a "wanna make friends" way. One day, her owner decided to surprise her beloved Sunshade and bought her a pet guinea pig. Then another, which had babies, and so on. Sunshade takes care of all of them like they're her stepchildren.

Jeremy Durkin/Rex Feature. Promotional rights granted by Lisa Rogak.

30. The tamarin monkey and his twin baby marmosets

Tom, a golden lion tamarin monkey at the Colchester zoo in the UK, broke with tradition when he started caring for a pair of twin silvery marmosets. Monkeys usually don't show interest in other breeds, but the twins are lucky Tom was brave enough to try because marmosets are small and wouldn't have been able to carry both twins at once. Tom the tamarin had no problem toting the pair.