Abstract
Three species of hedgehog (Insectivora) were chosen to represent temperate (Erinaceus europaeus), semi-arid (Hemiechinus auritus), and desert regions (Paraechinus aethiopicus). Metabolic rates, temperature regulation, and evaporation of water were studied under laboratory conditions. All three species maintained their body temperature close to 34 C (about 3-4 C lower than other mammals). All three species are competent temperature regulators which at low air temperature maintain body temperature by increasing oxygen consumption, and at high air temperature by increasing the evaporation of water. The rate of oxygen consumption is lowest in the desert species (Paraechinus) and highest in the temperate species (Erinaceus). However, thermoregulatory abilities are similar in all three species and not readily correlated with their geographical distribution.
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