It’s an evolutionary mystery that’s literally as plain as the nose on your face. Why did our ancestors develop a prominent protruding nose when most primates have flat nasal openings? Image: M&R Glasgow
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Astonishing fossils are found every year, but we still haven’t dug up the original “missing link”. Where is this last common ancestor of humans and chimps? “I would love to know,” says Sergio Almécija of the George Washington University in Washington DC. “That question is keeping me awake at night.” Image: twoshortplanks
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Where did early humans bed down for the night? Evidence that some chimps routinely eschew the safety of treetops to sleep on the ground raises the possibility that some early hominins did too – and that could have implications for our forerunners’ cognitive development. Image: Martin Pettitt
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Whoever heard of birds cooperating on a project together? Sure, a pair may build a nest together, but cooperating on a single task to get food is something only primates have been thought capable of. Now it turns out that rooks, like chimps, can cooperate – although they may lack the competitive edge needed understand teamwork properly. Image: foxypar4
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