New paper on birds warming up

A team including David and three of his students from the University of Puerto Rico published a new paper in Animal Behaviour. The main result is that Adelaide's warblers 'warm up' over the first few hours of morning singing. warming up has been studied in human singers and athletes, but this is the first study to show the effect in an animal display. We propose that selection pressure to warm up quickly may have contributed to the evolution of intense morning singing.