Monkey Arena (2005)

Monkey Arena is a fast-paced, monkey combat board game from 3am Games. From the back of the box:

Eight monkeys enter, one monkey leaves! The incompetent zoo keeper has left the zoo cages unlocked, leaving the residents to do as they please. The primates have gathered in the monkey cage to see who’s the toughest monkey around. Anything goes in this hair-pulling, rock-throwing, no-holds-barred cage match. Sticks, slaps, rakes, and pokes are the means by which the alpha male will emerge from the melee. Pick a monkey, enter the ring, and let the rumble begin in this wacky game of simian combat.