Fig. 1. Changes in thermoregulatory behaviour of Crocodylus porosus during acclimation. At the start of acclimation, all animals heated to the same maximum body temperature (T_b) during the day (A; means are shown, and all means ± s.e.m. <0.3°C). At the end of the acclimation period, crocodiles still displayed their characteristic thermoregulatory pattern, but maximum body temperatures of cold-acclimated animals (broken line) were significantly lower (B). During cold acclimation, maximum body temperatures (C; means ± s.e.m.) and mean daily body temperatures (D; means ± s.e.m.) decreased significantly.