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Related Concept Videos

Communication01:03

Communication

Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
Convergent Evolution01:54

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
The Cochlea01:13

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
Nonconscious Mimicry01:13

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.

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Related Experiment Video

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Recording Mouse Ultrasonic Vocalizations to Evaluate Social Communication
10:28

Recording Mouse Ultrasonic Vocalizations to Evaluate Social Communication

Published on: June 5, 2016

Bat echolocation calls facilitate social communication.

Mirjam Knörnschild1, Kirsten Jung, Martina Nagy

  • 1Institute of Experimental Ecology, University of Ulm, Albert-Einstein-Allee 11, 89069 Ulm, Germany. mirjam.knoernschild@uni-ulm.de

Proceedings. Biological Sciences
|October 5, 2012
PubMed
Summary

Bats use echolocation calls not just for navigation but also for social communication. Free-living male bats can identify the sex and identity of other bats by listening to their echolocation calls.

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Area of Science:

  • Animal Behavior
  • Bioacoustics
  • Echolocation

Background:

  • Bat echolocation is crucial for orientation and foraging.
  • Its role in social communication, particularly in wild populations, remains understudied.
  • Vocal signatures within echolocation calls for social information have not been investigated in free-living bats.

Purpose of the Study:

  • To investigate the communicative function of echolocation calls in the bat Saccopteryx bilineata.
  • To determine if echolocation calls encode social information like sex and individual identity.
  • To test if free-living bats can eavesdrop on these vocal signatures for social interactions.

Main Methods:

  • Analysis of echolocation calls from Saccopteryx bilineata.
  • Experimental playback of echolocation calls to free-living males.
  • Observation and recording of behavioral responses to different vocal signatures.

Main Results:

  • Echolocation calls of Saccopteryx bilineata contain distinct vocal signatures for sex and individual identity.
  • Free-living males could differentiate between male and female conspecifics based solely on echolocation calls.
  • Males exhibited context-appropriate social vocalizations (aggressive or courtship) in response to playback calls.

Conclusions:

  • Social information is encoded in bat echolocation calls, playing a significant role in eavesdropping.
  • Echolocation facilitates complex social communication in nocturnal, mobile mammals.
  • The communicative potential of bat echolocation is crucial and previously underestimated.