Photo: Family Walks on All Fours, May Offer Evolution Insight, Experts Say

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Siblings walk on all fours in rural Turkey. Three sisters and two brothers (one of whom is not shown) are almost exclusively quadrupedal, due to a genetic defect, scientists say.


Photograph courtesy BBC, from the TV documentary The Family That Walks on All Fours, airing on March 17 in the U.K. on BBC Two

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