These are Black and White Colobus Monkeys at the Minnesota Zoo. These monkeys have multi-chambered stomachs which allows them to digest leaves and unripe fruit that other monkeys can't, so they spend almost their entire lives in the trees without having to touch the ground. Unlike other monkeys these guys also don't have thumbs, just four fingers.

They use branches as trampolines to launch themselves into leaps of up to 50 feet. Their mantle hair and tail are believed to act as a parachute during these long leaps.