Bats spend most of their lives roosting, and how they spend their time affects their fitness. I studied the activity budgets of Townsend's Big-eared Bats (Corynorhinus townsendii) in a maternity roost and compared my results with those of 3 similar studies to identify generalizations that exist among species. I used an infrared camera to videotape bats in an attic in northeastern Oregon over a 24-h period once per week for 9 wk during the summer of 1999. In the lab, I used scan-sampling to document time spent in various behaviors. As reported for other species, C. townsendii spent most of its time in the roost resting. Grooming and other active behaviors peaked in the 2 h before emergence and in the 2 h after the last return to the roost in the morning. Little seasonal variation occurred in the day-roosting activity budget, and this was explained partially by temperature, but not by week of data collection. Greater seasonal variation existed during night-roosting while lactating, with time spent resting decreasing and activity increasing as pups got older. When unattended at night, pups rested less than adults and increased time spent grooming as they developed. Solitary individuals, those in small clusters, and those on the periphery of large clusters were more active and rested less frequently than those in the interior of large clusters.
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Vol. 91 • No. 1