ThermalPrefData – Data collected from thermal gradient preference experiments Frog – Individual identification number given to individual frogs in the laboratory Moisture – Categorical representation of wet or dry substrate in thermal gradient TrialHydr – Categorical frog hydration (% of standard mass) level of treatment Hydr – Actual % of standard mass of frog prior to trial AvgTb – Body temperature (°C) of frog averaged from each observation for a trial VarTb – Variance of body temperature (°C) of frog for all observations of a trial Mass – Mass (g) of frog prior to a trial Mitchell and Bergmann. Thermal and moisture habitat preferences do not maximize jumping performance in frogs. Funcational Ecology.