It's all fun and games (we think) when a dolphin plays piggyback with a whale. (Photo: The Whale and Dolphin People Project)

Why do dolphins hitch rides on whales?

Animals often have symbiotic relationships. Egrets hang out on the backs of many large animals, picking parasites in exchange for free food and transportation. Plovers act as dentists, eating the leftover food inside the mouths of crocodiles. But this relationship is baffling. Sometimes dolphins hitch rides on the backs of humpback whales — and it’s very possible that the only thing either party is getting out of it is a little bit of fun.

>> Lees verder