LONDON (AFP) - The discovery of a Turkish family that walks on all fours could aid research into the evolution of humans.

Researchers believe the five brothers and sisters, who can walk naturally only on all fours, may provide new information on how humans evolved from four-legged hominids to walk upright.

Nicholas Humphrey, evolutionary psychologist at the London School of Economics, told The Times the discovery opened "an extraordinary window on our past".

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