The solution is more than vestigial. Some 20 million years or so ago, our evolving ancestors had tails. Many humans today grow a tail in the womb, but it’s gone before two months of gestation.

So you don't need a tail as a counterbalance. Pretty disappointing, huh? That being said, you can still see a reminder of a time when our ancient primate ancestors had one. Just look at a human spine.

Humans do not have tails, but do we have “what it takes” for a tail? Hens don’t have teeth, but they have the genes for it. With atavism, it is as if our genomes serve as archives of our ...

So you don't need a tail as a counterbalance. Pretty disappointing, huh? That being said, you can still see a reminder of a time when our ancient primate ancestors had one. Just look at a human spine.