The importance of natural soundscapes as an indicator of the health of our natural world has been highlighted in national press this week. Scientists who use ecoacoustics to measure habitats are quoted as saying that quieter habitats - with diminishing morning calls of birds, rustle of mammals through undergrowth and summer hum of insects are an indicator of losses in the density and variety of species. As technology develops, sound has become an increasingly important way of measuring the health and biodiversity of ecosystems: our forests, soils and oceans all produce their own acoustic signatures.