The diet of mastiff bats consists of larger, hard-shelled insects, particularly beetles, as well as moths. Eumops are specialized for rapid aerial pursuit of these insects. The long narrow wings and the ability to retract their tail membrane allow the bats in this genus to reduce drag and enhance speed. Eumops have rapid and relatively straight flight compared to that of other insectivorous bats. Laterally placed eyes and ears give Eumops a wide field of perception, which aids in capturing prey. All Eumops emit echolocation "chirps" which are audible to humans. This system allows Eumops to locate prey and then catch it in mid-flight. (Emmons and Feer 1990, Findley 1993, Macdonald 1993, Nowak 1999, Redford and Eisenburg 1992, Reid 1997)
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