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Facultative migrations are observed across vertebrate taxa, include irruptive and nomadic movements, and occur in response to ephemeral and unpredictably variable resources. While the physiology underlying seasonal, obligate migrations is thoroughly studied, much less is known about the physiological mechanisms of facultative movements. We test two hypotheses in a free‐living, nomadic bird, the...
Although predators can deter an animal from regulating its body temperature by basking or shuttling, this response to predation should depend on the spatial distribution of thermal resources.
By simulating predation risk, we showed that movement, thermoregulation and corticosterone of male lizards (Sceloporus jarrovi) depended on the spatial distribution of shade.
Simulated risk caused lizards...
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