Abstract 1. 1. The ocellated lizard, Chalcides ocellatus, and the common lizard, Lacerta vivipara, were acclimated to two temperature regimes (10 and 30°C with 12L:12D photoperiod) for 2 weeks. 2. 2. The oxygen consumption rates were measured for both species at temperatures between 5 and 35 °C. 3. 3. Cold acclimation was observed in L. vivipara and was in the form of an upward translation of the metabolic rate-temperature curve in comparison to the warm-acclimated lizards (30°C). 4. 4. Chalcides ocellatus showed a response to cold acclimation by decreasing its metabolism only at 10°C.