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📘 How does an elephant use infrasound?

Human hearing is often described as extending down to about 20 hertz, though the exact limit varies with age and loudness. Infrasound is sound below that range. Elephants produce rumbles with very low fundamental frequencies, so a person ne

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. A rumble can be sound we cannot hearDefine infrasound, connect long wavelengths to rumbles, and explain how calls support family contact across distance.Elephant rumbles include low frequencies that can bridge gaps between separated animals.
  2. The body makes and receives the callTrace production and detection through air and ground, and describe non-invasive acoustic monitoring.Vocal folds, feet, sensors, and social context all shape how rumbles are sent and interpreted.
  3. A signal is useful only in contextExplain signal-to-noise ratio and the limits of infrasound range in real landscapes.Infrasound is useful, but distance, terrain, and human noise shape what survives the journey.

Questions this course answers

What makes part of an elephant rumble infrasonic?

Infrasound is defined by frequency, not by whether the sound is loud or whether it travels through air.

Why can a low-frequency rumble help separated elephants stay in contact?

Low-frequency calls can travel useful distances, but range still depends on habitat, noise, distance, and signal strength.

Put the broad pathway of a vocal rumble in order.

A call begins with a source, is shaped by the vocal tract, travels, and is then detected by a listener.

Match each recording method to what it measures most directly.

Different instruments sample different parts of the same event, so combining them helps separate sound, vibration, location, and behavior.

Why might an elephant rumble be detected in both air and ground?

A rumble can have acoustic and seismic components, though their strength and detectability depend on the setting.

Explain how infrasound can help an elephant family without acting like human speech.

Animal communication can carry useful information without being a word-for-word language.

Grounded in trusted sources

  • Elephant Listening Project, Eavesdropping on Elephants, https://www.elephantlisteningproject.org/infrasound/
  • Elephant Listening Project, Prying Open an Elephant Dictionary, https://www.elephantlisteningproject.org/elephant-dictionary/
  • Elephant Listening Project, The Idea, https://www.elephantlisteningproject.org/elp-story/
  • O'Connell-Rodwell et al., Seismic localization of elephant rumbles as a monitoring approach, PLOS ONE, https://pmc.ncbi.nlm.nih.gov/articles/PMC8277467/
  • Mortimer et al., Noise matters: elephants show risk-avoidance behaviour in response to human-generated seismic cues, Royal Society Open Science, https://pmc.ncbi.nlm.nih.gov/articles/PMC8242925/
  • Krause et al., Vocal learning in elephants: neural bases and adaptive context, Current Opinion in Neurobiology, https://pmc.ncbi.nlm.nih.gov/articles/PMC4181794/
  • Wikimedia Commons MediaWiki API, image metadata and thumbnails, https://commons.wikimedia.org/w/api.php

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