Van den Ven, T.M.F.N.; Martin, R.O.; Vink, T.J.F.; McKechnie, Andrew E.; Cunnigham, S.J.
(Public Library of Science, 2016-05-18)
Beaks are increasingly recognised as important contributors to avian thermoregulation.
Several studies supporting Allen’s rule demonstrate how beak size is under strong selection
related to latitude and/or air temperature ...