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Related Concept Videos

Heart Sounds01:15

Heart Sounds

Heart sounds are generated by the turbulence in blood flow due to the closing of heart valves. These sounds are best perceived slightly away from the valves, where the blood flow disseminates the sound.
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V) valves at the...
Ultrasonography01:17

Ultrasonography

Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called a...
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.
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...
Physical Assessment of the Respiratory Tract IV: Auscultation01:28

Physical Assessment of the Respiratory Tract IV: Auscultation

Auscultation is a crucial component of the physical assessment of the respiratory tract. It offers valuable insights into airflow through the bronchial tree and potential lung obstructions. This process involves careful listening to breath, voice, and adventitious sounds, which can reveal a wealth of information about a patient's respiratory health.
Breath Sounds
Breath sounds are categorized into vesicular, bronchovesicular, and bronchial.
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.

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Related Experiment Video

Updated: May 8, 2026

Eliciting and Analyzing Male Mouse Ultrasonic Vocalization (USV) Songs
08:44

Eliciting and Analyzing Male Mouse Ultrasonic Vocalization (USV) Songs

Published on: May 9, 2017

Ultrasonic vocalizations emitted by flying squirrels.

Meghan N Murrant1, Jeff Bowman, Colin J Garroway

  • 1Environmental and Life Sciences Graduate Program, Trent University, Peterborough, Ontario, Canada.

Plos One
|September 7, 2013
PubMed
Summary

Flying squirrels produce ultrasonic vocalizations, including frequency-modulated calls, suggesting a role in communication. This study provides the first detailed analysis of these poorly understood sounds in flying squirrel social biology.

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Last Updated: May 8, 2026

Eliciting and Analyzing Male Mouse Ultrasonic Vocalization (USV) Songs
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Published on: May 9, 2017

Recording Mouse Ultrasonic Vocalizations to Evaluate Social Communication
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Published on: June 5, 2016

Determining Ultrasonic Vocalization Preferences in Mice using a Two-choice Playback Test
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Determining Ultrasonic Vocalization Preferences in Mice using a Two-choice Playback Test

Published on: September 3, 2015

Area of Science:

  • Zoology
  • Bioacoustics
  • Animal Communication

Background:

  • Anecdotal evidence suggests flying squirrels may use ultrasound.
  • Limited scientific analysis exists on flying squirrel vocalizations.

Purpose of the Study:

  • To investigate and document ultrasonic vocalizations in two species of flying squirrels.
  • To analyze the characteristics and potential function of these emissions.

Main Methods:

  • Recorded vocalizations from northern (Glaucomys sabrinus) and southern (G. volans) flying squirrels.
  • Recordings were made in laboratory settings and a field site in Ontario, Canada.
  • Analyzed acoustic properties of recorded sounds, including broadband noise and FM vocalizations.

Main Results:

  • Confirmed that flying squirrels emit ultrasonic vocalizations.
  • Identified three types of ultrasonic calls in laboratory settings and one type in the field.
  • Observed both broadband noise bursts and frequency-modulated (FM) ultrasonic calls.

Conclusions:

  • Flying squirrels produce a variety of ultrasonic signals.
  • These vocalizations may play a significant role in flying squirrel communication and social behavior.
  • Further research is needed to fully understand the function of ultrasonic vocalizations in flying squirrels.