@BohoBabe monkeys have tails, but we're apes and all apes lost tails around 25 million years ago when the common ancestor for apes picked up an aberration in a gene called TBXT (yes, all apes, including you and I, still carry that glitch).
The vestigial tail's still there in the form of your coccyx and occasionally babies are born with tails (they're surgically removed - it's quick and simple).
