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The small microchiropteran bat, Chalinolobus gouldii, undergoes large daily fluctuations in metabolic rate, body temperature, and breathing pattern. These alterations are accompanied by changes in surfactant composition, predominantly an increase in cholesterol relative to phospholipid during torpor. Furthermore, the surface activity changes, such that the surfactant functions most effectively at that temperature which matches the animal’s activity state. Here, we examine the surface activity of surfactant from bats during arousal from torpor. Bats were housed at 24°C on an 8:16h light:dark cycle and their surfactant was collected during arousal (28<T_b<32°C). Surface activity was examined with a Captive Bubble Surfactometer at 24 and 37°C. Surfactant from arousing bats was more active at 37°C than at 24°C, indicated by a lower ST_min and reduced film area compression required to reach ST_min. It appears that the …