Sonic weapons usually leave no physical marks but can be devastating psychologically.
From Long Range Acoustic Devices used to disperse protesters to ear-splitting military drones to songs blasted on rotation to prisoners, ours is an age in which sound has been repositioned as a tool of terror.
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One species of bat is able to switch from hearing to echolocation when there's too much noise, according to new research.
Sperm whales, like many other species, use echolocation which can be hampered by noise.
Gabriel Barathieu/Wikimedia Commons
We tend to think of the oceans as quiet, when in fact they're anything but. Noise is the "forgotten pollutant", but the good news is that unlike many other pollutants it can be switched off if we try.
The author began hearing the sound at night, between the hours of 10 and 11 p.m.
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Shortly after Glen MacPherson started hearing strange humming noises, he created the World Hum and Database Project so people around the world could document their own experiences with the Hum.
I can definitely see you.
Man-made noise changes the way animals respond to danger – but prairie dogs have a surprising reaction.
Too much background noise has been linked to heart disease, strokes and even holding back children's learning.
Urban noise pushes birds to sing in high pitch and ship sound deafens whales and dolphins.
John Haslam, Eric Bégin, IK's World Trip, Green Fire Productions, flickker photos, Jay Ebberly / Flickr
Noise pollution, whether on land or under water, can affect animals in interesting – and not always positive – ways.