Hanuise Nicolas, Bost Charles-Andr&eacute;, Huin William, Auber Arnaud, Halsey Lewis G, Handrich Yves, . (2010). Measuring foraging activity in a deep-diving bird: comparing wiggles, oesophageal temperatures and beak-opening angles as proxies of feeding.. J. Exp. Biol., 213(Pt 22), 3874–80.