Monk Saki Monkeys have long, shaggy hair around their face and neck. Their fur is brown-grey mottled, beard and belly are reddish. The shy Monk Saki Monkeys have a length of35-50cm the long bushy seizing-tail can be up to 50 cm long. Monk Saki Monkeys are always staying on top of the trees, they’re never climbing down to the ground. They are feeding on leaves, fruit, berries, small birds and mammals, even bats.