Fig. 1. Infrared thermographs of a newly hatched Madagascar ground gecko Paroedura pictus exhibiting shuttling behavior. The subject is confined to a Plexiglas cylinder and chooses between a surface temperature of 16°C on the left (blue surface) and 41°C on the right (yellow surface). In this 2-min sequence, the hatchling begins on the cold side of the apparatus (A). In the next frame (B), it has crossed over to the hot side where it remains stationary and gains heat from the hot floor (C). Eventually, it begins to move again (D) and crosses back over to the cold side of the apparatus (E) where it gradually loses heat to the cold surface (F). As indicated, the labels `cold exit' and `hot exit' denote the frames preceding a crossover to the hot and cold side of the apparatus, respectively.

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