A SM4 bat detector that records ultrasonic ball calls is placed on top of a pole in Grand Canyon as part of a study

A SM4 bat detector is placed on top of a pole in Grand Canyon near the Colorado River, below Emerald Rapid. This weatherproof detector records ultrasonic bat calls. The recording is part of an ongoing study that is examining bat abundance and foraging in Grand Canyon along the Colorado River. For more information, see: Metcalfe, A.N., Fritzinger, C.A., Weller, T.J., Dodrill, M.J., Muehlbauer, J.D., Yackulic, C.B., Holton, P.B., Szydlo, C.M., Durning, L.E., Sankey, J.B., and Kennedy, T.A., 2023, Insectivorous bat foraging tracks the availability of aquatic flies (Diptera): The Journal of Wildlife Management, e22414, https://doi.org/10.1002/jwmg.22414.