The hammer-headed bat (Hypsignathus monstrosus), also known as the big-lipped bat, is widely distributed in equatorial Africa. This large bat is found in riverine forests, mangroves, swamps, and palm forests at elevations less than 1800 meters.
Gordon, T.T., 2001. The Calling Behavior and Mating System of a Non-Lekking Population of Hypsignathus monstrosus. Ph.D. Thesis, State University of New York at Stony Brook.
Langevin, P., Barclay, R.M.R., 1990. Hypsignathus monstrosus. Mammalian Species, 1-4.