div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: A Mammalian Activity Rhythm independent of Temperature src=https:reader031vdocumentssitereader031viewer20220204055750680c1a28ab0f07ae5d55html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp1958© Nature Publishing Grouppdiv