Data from: Smaller beaks for colder winters: Thermoregulation drives beak size evolution in Australasian songbirds

Nicholas R. Friedman, Lenka Harmáčková, Evan P. Economo & Vladimir Remes
Birds’ beaks play a key role in foraging, and most research on their size and shape has focused on this function. Recent findings suggest that beaks may also be important for thermoregulation, and this may drive morphological evolution as predicted by Allen's rule. However, the role of thermoregulation in the evolution of beak size across species remains largely unexplored. In particular, it remains unclear whether the need for retaining heat in the winter or dissipating...
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