| avian thermoregulation in the heat: evaporative cooling capacity of arid-zone caprimulgiforms from two continents. | birds in the order caprimulgiformes (nightjars and allies) have a remarkable capacity for thermoregulation over a wide range of environmental temperatures, exhibiting pronounced heterothermy in cool conditions and extreme heat tolerance at high environmental temperatures. we measured thermoregulatory responses to acute heat stress in three species of caprimulgiforms that nest in areas of extreme heat and aridity, the common poorwill (phalaenoptilus nuttallii: caprimulgidae) and lesser nighthawk ... | 2017 | 28760832 |