What is the function of a tail in monkeys?

Tamarins have relatively longer tails than squirrel monkeys, move their tails through greater angular amplitudes, at higher angular velocities, and with greater angular accelerations, suggesting dynamic use of tail to regulate whole-body angular momentum. read more

The tail in the lizard may be partially prehensile, but is also used as a defense mechanism. When lizards attempt to escape predators, many of them have tails that can safely detach. This allows the lizard to escape a predator that grabs it. read more

Monkeys, OTOH, tend to walk quadrupedally on the top of tree branches. During this type of motion, the tail serves mainly as a balance. There are other uses of the tail, observed in captivity, described in the following paper. read more