Abstract

Echolocating bats are known to continuously generate high frequency sonar pulses and listen to the reflecting echoes to localize objects and orient in the environment. However, silent behavior has been reported in a recent paper, which demonstrated that the big brown bat (Eptesicus fuscus) can fly a relative long distant (0.6 to 8 m) without echolocating when flying with another conspecific in a large flight room.1 Methodology and conclusion developed in this study have the potential for further experimental design to answer the question of how millions of bats navigate and orient in cohesive groups. In addition, the discovery of silent behavior suggests the possible use of cooperative sonar in echolocating animals.

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