 They are generally slow flying bats, flying low to the ground or water, and grabbing insects with their large feet.While hunting, they have been reported to use short, 2 to 5 millisecond, frequency modulated calls, sweeping down from 75 to 43 kHz, at sound levels of up to at least 111 dB.Males and females roost together, and the females are promiscuous, mating with several of their partners.