If animals need their tail to sway and balance, why animals without tails or short tails don’t fall off?

Question

Edit: I mean, why animals with broken or cut off tails, don’t have any problems balancing?

In: Biology

Answer 1

Fall off what? Different animals evolved different anatomies to meet the requirements of their environment – humans (tailless primates) would certainly be less apt to swing from branch to branch than say gibbons or rhesus monkeys because humans spent ~2MM years evolving to walk upright on hard ground and the other two didn’t.