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The endangered Hawaiian hoary bat, Lasiurus cinereus semotus (H. Allen), has an island-wide distribution on the island of Hawai'i. However, abundance estimates suggest that its endangered status is appropriate. Although distributed across wide ranges in elevation, temperature, and rainfall, this bat is most often associated with native vegetation. Its diurnal and seasonal activity patterns argue against migration within the island of Hawai'i. These patterns suggest that the Hawaiian bat uses more than one foraging site and that its use of foraging sites is influenced by changes in insect biomass.