Abstract
Based on a sample of cloacal body temperatures taken from four species of varanids in the semi-arid regions of Western Australia, Pianka (1994) reported Varanus eremius and V. gouldii to be good thermoregulators, while arboreal V. caudolineatus and V. tristis did not regulate as well. In addition, the mean body temperature for V. tristis (34.8 C) was signi cantly lower than that for V. eremius (37.3 C), V. gouldii (37.7 C) and V. caudolineatus (37.8 C). Pianka’s (1994) temperature recordings were taken on live varanids collected opportunistically in the eld. Our objective was to determine if the body temperature of V. tristis in the western Great Victoria Desert during the part of the day (1100 to 1800 h) when the lizards are active are generally lower than body temperatures reported for other varanids.
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