Hundreds of examples on YouTube show two or more animals wrestling, rolling or jumping on each other. It can look like friendship or courting. The best or most interesting type of play however, is when different species play with each other—when cross-species play.
Tame or home-raised animals often play together. This has also been documented on farms and in zoos. Another interesting occurrence is when animals that play have different strengths, are predators or even play-fight. Photographer Hugo Van Lawick observed an adult African gazelle playing with two young bat-eared foxes. Although their normal prey is mice or insects, the foxes are actually predators, but the gazelle chased the foxes in circles.
When two animals “play-fight," one usually plays the role of the attacker and the other defends itself. Two animals in the same species might change roles, practicing both attack and defense.
Animals that play together are not always evenly matched. One may be bolder, bigger, stronger than the other is. To make up for its size, a larger monkey for example, may crouch, slow its movements or self-handicap to keep from hurting the other animal.
In cross-species play, this is usually the case as well. One animal deliberately gives itself a disadvantage in order to initiate and engage in animal play as equals.