Habitat use and relative abundance of the spotted bat, Euderma maculatum, were examined in the river canyons of Dinosaur National Monument, Colorado, by monitoring audible echolocation calls. Spotted bats were found at all canyon sites, but were less common than other species of bats. We found no indications of foraging habitat restrictions. Spotted bats foraged ca. 10 m high and were active from dusk into the early morning hours.