We have studied resting metabolic rate (RMR) of the water monitor lizard (Varanus salvator) at different developmental stages (hatchling, juvenile and adult) to test whether individuals at different ages differ in RMR when controlling for the effects of body mass. We found that: 1) resting metabolic rates of hatchlings, juveniles and adults were all positively related to their body mass with the same coefficients and that 2) developmental stage had a non-significant influence on the resting metabolic rate when controlling for the effects of body mass. Our results suggest that variation in resting metabolic rate for V. salvator is directly caused by body mass differences, which conforms to previous findings in mammal species and birds.
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