Bat acous­tics

Down to Earth - - SCIENCE -

EQUA­TO­RIAL BATS do not re­quire so­phis­ti­cated hunt­ing tech­niques to ob­tain food as it is easily avail­able. Horse­shoe and ves­per bats found in tem­per­ate re­gion em­ploy a highly-so­phis­ti­cated echolo­cal­i­sa­tion tech­nique. When they close in on their prey, they are ca­pa­ble of vary­ing their calls. But equa­to­rial bats merely make the same loud noise through­out the process. If there is no evo­lu­tion, the most likely rea­son is that there is no need for it, says the study. PNAS, June 24

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