Every now and then I like to sit very quietly and listen. With things to do and places to go, we tune out of most sounds most of the time, but the world is rarely – if ever – silent. Taking a few moments to listen and try to identify as many different sounds as possible is a very peaceful thing to do. It’s also fascinating and the other day it got me thinking. The animal kingdom is rich with sound, a glorious spectrum of tones and timbres. The range of animal sounds almost defies imagination, and the various techniques employed to produce these sounds is equally impressive. More . . .