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 ...

Around 25 million years ago, an evolutionary split occurred between our ancestors, the precursors of humans and apes, and ...

WASHINGTON (Reuters) - Director James Cameron's "Avatar" movies are populated by a species of outsized blue beings resembling humans, except with tails. So why does our species lack a tail, ...

Scientists have found a mutation in our DNA that snipped our tails off. The mutation may have allowed our ancestors to walk upright. But it may also be behind a birth defect that still affects babies ...

(CNN) -- 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. (CNN) — ...

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