Abstract
SUMMARY (1) Two sympatric lizard species, Podarcis (= Lacerta) muralis brueggemanni and P. sicula campestris, were studied in Tuscany. (2) The daily cycle of behaviour is strongly influenced by weather conditions. P. muralis is active for approximately 255 days per year. (3) The mean active body temperatures maintained by the two species in the laboratory did not differ significantly, but in the field in August they differed by 1 6 ?C (P. muralis 33 6 ?C; P. sicula 35 2 ?C), although the maxima were identical (36 6 ?C). It is suggested that the difference in mean body temperature is a consequence of differences in habitat and foraging behaviour between the species. (4) Daily food consumption was estimated by method (b) of Avery (1971), using.pooled data for the two species. Consumption during hot weather in August was given by C= 346 WO65
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