What animal is featured in "Bloons TD Battles"?

The animal featured in Bloons TD Battles is monkeys. In the game, players deploy and upgrade various monkey towers to pop bloons (balloons) that are attempting to invade their territory. Each monkey tower has unique abilities and attack methods, such as shooting darts, throwing boomerangs, or launching missiles, making them essential in defending against the onslaught of bloons. Monkeys are the main characters and heroes in this strategic tower defense game.