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Thermoregulation is the pits: use of thermal radiation for retreat site selection by rattlesnakes

Aaron R. Krochmal and George S. Bakken^*

Department of Life Sciences, Indiana State University, 600 Chestnut Street, Terre Haute, Indiana 47809, USA

View larger version (75K): [in a new window]   Fig. 1. Thermal images of the refuges in the Y-maze (A), hide-box (B) and artificial burrow (C) experiments. All images were taken at a distance of 1 m from the radiating surface. The horizontal field of view subtended at an angle of 80°.

View larger version (12K): [in a new window]   Fig. 2. Western diamondback rattlesnakes can rely on their facial pits to mediate thermoregulatory behavior. The plot compares means and 95% confidence intervals for rattlesnakes with either open or blocked facial pits in (A) the Y-maze, (B) the circular arena with hide boxes or (C) the circular arena fitted with artificial burrows. The dashed lines represent the experiment-specific null-hypothesis prediction.