The popping sound, like milk hitting puffed rice cereal, that you hear when putting your head underwater is not your ear adjusting to a different atmosphere – it is the sound of the submarine world. Fish chat to each other, or move water with their fins; hard-shelled creatures scrape against the surfaces; molluscs drag themselves to their nooks.
There’s more to these clicks, clacks and pops than just the tuneful wonder of it all. Oceanographers now say that monitoring the sounds of coral reefs can serve as a non-intrusive, inexpensive and efficient method for tracking the state of their health – and for planning better conservation interventions in the long run.
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