The Energy Budget of a Lizard on a Tree Trunk

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Abstract
Lizard and environmental properties which determine the exchange of energy between a lizard and its environment are described and related analytically in the equilibrium state to the lizard temperature. Absorptivities, surface areas, body temperatures, and convection coefficients were determined; metabolic and evaporative energy exchanges estimated for a representative Sceloporus occidentialis. The environmental properties of a particular tree trunk habitat are estimated for a June 21 day and the behavior of S. occidentialis predicted in terms of the positions lizards could assume and maintain their body temperatures within the range characteristic of the population in that habitat. The predictions are compared with field observations.

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