div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: J N Weber et al Nature 493 402 - 405 2013 doi:101038nature 11816 src=https:reader038fdocumentsusreader038viewer202210290856812d1b550346895d921311html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divpJN Weber et al Nature 493 402-405 2013 doi:101038nature11816p pNatural variation in P polionotus burrowspdiv