Check out Brilliant (and get 20% off) here: Sounds that animals make can be really different, and it turns out that there's a reason why some species communicate with certain sounds. Thanks also to our Patreon patrons and our YouTube members. ___________________________________________ To learn more, start your googling with these keywords: frequency - how often a wave occurs in a certain unit of time Hertz - a unit of frequency (Hz), the number of waves that occus in a second pitch - a perceptual property of sounds that allows their ordering on a frequency-related scale echolocation - the location of objects by reflected sound refraction - the change in direction of a wave diffraction - the bending of waves around obstacles and the spreading out of waves beyond openings ___________________________________________ Subscribe to MinuteEarth on YouTube: Support us on Patreon: And visit our website: Say hello on Facebook: And Twitter: And download our videos on itunes: ___________________________________________ Credits (and Twitter handles): Video Writer, Director, and Narrator: Kate Yoshida (@KateYoshida) Video Illustrator: Arcadi Garcia Rius (@garirius) With Contributions From: Henry Reich, Alex Reich, Ever Salazar, Peter Reich, David Goldenberg, Julián Gómez, Sarah Berman Music by: Nathaniel Schroeder: ___________________________________________ References: Arch, V. A. and P. M. Narins. 2008. “Silent” signals: selective forces acting on ultrasonic communication systems in terrestrial vertebrates. Animal Behaviour 76: 1423–1428. Bedard Jr. and T. M. Georges. 2000. Atmospheric Infrasound, Physics Today, 53(3): 32-37. Ladich F. and H. Winkler. 2017. Acoustic communication in terrestrial and aquatic vertebrates,” Journal of Experimental Biology 220: 2306–2317. Michelsen, A. and O.N. Larsen. 1983. Strategies for acoustic communication in complex environments. In: Neuroethology and Behavioural Physiology (ed Huber, F. and Markl, H.) pp. 321-331 Berlin: Springer-Verlag. Narins, P.M., A.S. Stoeger, and C. O'Connell-Rodwell. 2016. Infrasonic and seismic communication in the vertebrates with special emphasis on the Afrotheria: An update and future directions. In Vertebrate Sound Production and Acoustic Communication (ed. R. A. Suthers, W. T. Fitch, R. R. Fay and A. N. Popper), pp. 191-227. Cham: Springer.