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Significance Close-by active sensing animals may interfere with each other. We investigated what echolocators flying in a group hear—can they detect each other after all? We modeled perceptual and acoustic properties in group echolocation to quantify neighbor detection probability as group size increases. Echolocating bats can detect at least 1 of their closest neighbors per call up to group sizes of even 100 bats. Call parameters such as call rate and call duration also play a strong role in how much echolocators in a group interfere with each other. Even when many bats fly together, they are indeed able to detect at least their nearest frontal neighbors—and this prevents them from colliding into one another.

Modeling active sensing reveals echo detection even in large groups of bats