Back in 2003, a very sad thing happened: Glasgow Zoo closed down for good. A lack of visitors and around £3 million of debt buried the once much-loved attraction, with Scottish animal lovers obliged to go to Edinburgh Zoo to get their wildlife fix.
But the former sanctuary lives on thanks to this particular YouTube video, which shows archive footage of a former resident by the name of Simba playing with a bunny and a dog.
13 weeks old at the time, the baby lion even spars with its human keepers, tussling on the bed and generally having a whale of a time - even though he was only meant to be in the house because of an illness he picked up over the winter, the cheeky cub.
Of course, he's not the only animal to makes friends with other unlikely pals, as our unlikely animal friendships picture gallery proves beyond a shadow of a doubt...
Piglet and Rhodesian Ridgeback
Monkey and Dove
Orangutan Baby and Tiger Cub
Pitbull, Siamese cat and chicks
Macaque and the Kitten
Elephant and sheep
Owlet and the Greyhound
Lion, Tiger and Bear
Hippo and Goat
Iguana and cat