Greenberg, Russell S.; Cadena, Viviana; Danner, Raymond M.; Tattersall, Glenn(2012)
BackgroundResearch on variation in bill morphology has focused on the role of diet. Bills have other functions, however, including a role in heat and water balance. The role of the bill in heat loss may be particularly ...
The hypothesis is tested that birds in hotter and drier environments may have larger bills to increase the surface area for heat dissipation. California provides a climatic gradient to test the influence of climate on bill ...
