Some monkeys use this as a fifth limb; it's prehensile, after all
... are 
seen having the prehensile tails, that means they can use their tail as a fifth limb, 
... All monkeys use their feet as well as their hands for climbing and balance and 
have ... Several religions feature the monkey, though it's usually associated with... [DOC] [TLE] Monkey, Black-Handed Spider - LA Zoo [PAR] The black-handed spider monkey has a truly prehensile tail which is ... Its long 
prehensile tail is more developed than in any other primate, and is used as a fifth 
limb.