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How do bats use echolocation to locate insects?
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Vespid wasps (Vespidae), similar to other insects, have compound eyes that consist of thousands of tiny optical units known as ommatidia, which contain light-sensitive photoreceptor cells.
Bats use echolocation to locate insects by emitting high-frequency sound pulses through their nose or mouth and interpreting the returning echoes. These pulses reflect off the insect, providing the bat with information regarding the prey's distance, direction, velocity, and size.1
The process occurs in three distinct phases of pulse output:1
- Search phase: The bat emits approximately 10 pulses per second while scanning for targets.1
- Approach phase: Once an insect is detected, the bat increases the pulse rate to 25–50 per second and shortens pulse duration as it closes the distance.1
- Terminal phase: During final interception, the bat emits extremely short pulses at rates of 200 or more per second.1
To process this data, bats rely on specialized ears and a nervous system capable of rapid auditory integration. They determine target direction by comparing frequency intensities at each ear and calculate velocity using the Doppler effect, which measures shifts in frequency caused by relative motion. Additionally, a protein called prestin enhances their sensitivity to these high-frequency echoes.12