This undated photo provided by Raffaello Pellizzon in December 2016 shows fossilized footprints of a human ancestor, believed to be Australopithecus afarensis, at the Laetoli site in northern Tanzania. (Raffaello Pellizzon via AP)
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The 13 footprints are impressions left in volcanic ash that later hardened into rock, excavated last year in northern Tanzania in Africa.Authors include Giorgio Manzi of Sapienza University in Rome, Marco Cherin of the University of Perugia in Italy, and others.Nobody knows the ages or sexes of any of the track-makers, although the size of the latest footprints suggest they were made by a male. It's quite possible that the new discovery means A. afarensis males were a lot bigger than females, with more of a difference than what is seen in modern humans, the researchers say. That's because scientists haven't recovered enough of an A. afarensis foot to reliably calculate height from footprints, he said in an email.
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