Just 300,000 years ago a blink in evolutionary time at least nine species of humans wandered the planet. Today, only our own, Homo sapiens, remains.
It's not a coincidence that several of them disappeared around the time that Homo sapiens started to spread out of Africa and around the rest of the world, says Prof Chris Stringer, head of human origins at the Natural History Museum in London.
About 300,000 years ago, the first H sapiens populations were springing up in Africa... They didn't have the glowering brows of Neanderthals (Homo neanderthalensis) or the protruding jaw of archaic-looking species such as Homo naledi.
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