因應熱調節而最佳化鳥喙大小 (Beak size optimized for thermal regulation)
相對於不同的緯度及環境溫度,鳥喙大小會有所變異,因此為了因應熱調節,鳥喙會有最佳化的大小,此概念稱為艾倫定律(Allen’s rule)。
(The beak size of birds is optimized for thermal regulation because they vary in size relative to latitude and environmental temperature, a concept called Allen’s rule.)