div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: A Sidelight on Bird Migration src=https:reader036fdocumentsnetreader036viewer2022080107575067be1a28ab0f07acf08dhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1924 Nature Publishing Grouppdiv