How echolocating bats use returning sound
Many bats emit calls and analyse returning echoes to locate obstacles and prey. The delay helps indicate distance, while other features carry information about direction and movement. Echolocation complements other senses; it does not mean bats are blind or that every bat uses the same kind of sound system.
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Listen for the result of a call
An echolocating bat sends out sound and receives reflections from nearby objects. Because sound takes time to travel outward and back, the echo's delay contains information about distance.
Differences between the ears and changes in echo structure help provide other information. Frequency shifts can also reveal relative movement in relevant circumstances.
The animal interprets a changing stream of echoes while moving. Calls and listening behaviour can change as it approaches prey or navigates cluttered surroundings.
- Longer echo delays indicate longer round trips.
- Echo direction helps locate objects.
- Echo features can distinguish aspects of targets.
Bats also use vision and other senses. Echolocation varies across species, and some bats rely mainly on sight and smell rather than the familiar laryngeal echolocation system.