The four sisters and one brother could yield clues to why our ancestors made the transition from four-legged to two-legged animals, says a UK expert.

But Professor Nicholas Humphrey rejects the idea that there is a "gene" for ipedalism, or upright walking

A BBC documentary about the family will be shown on Friday 17 March.

Professor Humphrey, from the London School of Economics (LSE), says that our own species" transition to walking on two feet must have been a more complex process that involved many changes to the skeleton and to the human genetic make-up.

However, a German group says a genetic abnormality does seem to be involved in the siblings" gait.

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