Which animal do you normally have to pin the tail on in the popular children's game?

Explanation

Pin the Tail on the Donkey is a game played by groups of children. It is common at birthday parties and other gatherings. A picture of a donkey with a missing tail is tacked to a wall within easy reach of children

One at a time, each child is blindfolded and handed a paper "tail" with a push pin or thumbtack poked through it. The blindfolded child is then spun around until he or she is disoriented. The child gropes around and tries to pin the tail on the donkey. The player who pins their tail closest to the target, the donkey's rear, wins.