8. White-faced Saki Monkey
Weirdness factor: Often called flying monkeys, white-faced sakis rarely let their feet hit the ground. They prefer to stay in the mid-level trees of the rain forest, where they can jump up to 30 feet in a single bound and can run upright along narrow branches. See it in: The rain forests of northeastern Brazil, French Guiana, Guyana, Suriname, and Venezuela (and the Elmwood Park Zoo in Norristown, Pa.).