You are probably aware of the fact that elephants make trumpeting noises – but did you know that most of their communication is so low pitched that humans can’t even hear it?
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Sources:
https://academic.oup.com/bioscience/article/49/5/353/227165
https://elephantlisteningproject.org/all-about-infrasound/
https://www.ncbi.nlm.nih.gov/books/NBK10924/
http://dev.physicslab.org/Document.aspx?doctype=3&filename=WavesSound_IntroSound.xml
https://www.sfu.ca/sonic-studio-webdav/handbook/Diffraction.html
https://journals.ametsoc.org/doi/full/10.1175/EI147.1
https://link.springer.com/article/10.1007/s00265-018-2451-4
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4191980/
Image Sources:
https://commons.wikimedia.org/wiki/File:Katy_Payne_-_Pop!Tech_2009_-_Camden,_ME_(4035567592)_(cropped).jpg
https://commons.wikimedia.org/wiki/File:Ultrasound_range_diagram.svg
https://commons.wikimedia.org/wiki/File:African_Elephant_(Loxodonta_africana)_bull_(31100819046).jpg
https://commons.wikimedia.org/wiki/File:Elephas_maximus_(Bandipur).jpg
https://commons.wikimedia.org/wiki/File:Angry_elephant_ears.jpg
https://commons.wikimedia.org/wiki/File:Forest_elephant.jpg
https://commons.wikimedia.org/wiki/File:Elephants_at_Amboseli_national_park_against_Mount_Kilimanjaro.jpg
https://commons.wikimedia.org/wiki/File:Asian_Elephant_at_Corbett_National_Park_15.jpg
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