Written by National Geographic magazine writer Jennifer Holland, Unlikely Friendships documents one heartwarming tale after another of animals who, with nothing else in common, bond in the most unexpected ways. A cat and a bird. A mare and a fawn. An elephant and a sheep. A snake and a hamster. The well-documented stories of Koko the gorilla and All Ball the kitten; and the hippo Owen and the tortoise Mzee. And almost inexplicable stories of predators befriending prey—an Indian leopard slips into a village every night to sleep with a calf. A lionness mothers a baby oryx.

It is exactly like Isaiah 11:6: “The wolf also shall dwell with the lamb, and the leopard shall lie down with the kid . . . ”

Ms. Holland narrates the details and arc of each story, and also offers insights into why—how the young leopard, probably motherless, sought maternal comfort with the calf, and how a baby oryx inspired the same mothering instinct in the lionness. Or, in the story of Kizzy, a nervous retired Greyhound, and Murphy, a red tabby, how cats and dogs actually understand each other’s body language. With Murphy’s friendship and support, Kizzy recovered from life as a racing dog and became a confident, loyal family pet.

These are the most amazing friendships between species, collected from around the world and documented in a selection of full-color candid photographs.