Learn more about the human tailbone and how, even though we may not have a strict need for it anymore, it still helps us with ...

Humans have many wonderful qualities, but we lack something that’s a common feature among most animals with backbones: a tail. Exactly why that is has been something of a mystery. Tails are useful for ...

For half a billion years or so, our ancestors sprouted tails. As fish, they used their tails to swim through the Cambrian seas. Much later, when they evolved into primates, their tails helped them ...

Humanity's ancestors have all had tails, but researchers may have identified the genetic mutation responsible for humans and certain primates losing the appendage, a new study suggests. A group of ...

Like spider monkeys, our ancestors’ tails helped them stay balanced in trees (Getty Images/iStockphoto) For half a billion years or so, our ancestors sprouted tails. Like fish, they used their tails ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Humans have many ...