Abstract
1. 1. Head and core temperatures were measured in anole ( Anolis carolinensis) and basilisk ( Basiliscus americanus) lizards exposed to ambient temperatures of 38°C and 40°C. 2. 2. There was very little difference in head-core-ambient temperature gradients between non-panting and dead animals exposed to 38°C or 40°C. 3. 3. When anoles panted at 40°C head temperature was 1.5°C below ambient resulting in a head-core gradient (1.3°C) significantly greater than that of non-panting or dead animals. 4. 4. Panting basilisk lizards maintained head temperature 2.46°C below ambient with a head-core gradient of 1.75°C. 5. 5. It is concluded that head-core-ambient temperature gradients in panting lizards is the result of increased evaporation from the buccal cavity as a consequence of opened-mouth panting.
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