The animals must not lie down in front of the goal or pick up the polo ball with their trunks, or the opposing team gets a free hit.

BBC: Polo-playing elephants in Nepal

Buzkashi is akin to polo, but players on horseback use a headless goat carcass instead of a ball.

NPR: Bombing Hits Sports Event In Afghanistan, 7 Killed

The ancestor of polo, this traditional game of horsemen is played with a dead goat rather than a ball.

BBC: Following the Silk Road to the end of China