A cough cannot be hidden—and when scallops cough, scientists should listen. A scallop "coughs" to expel feces and water from its central cavity; the friction between the mollusk's two valves makes a sharp crack, followed by a drawn-out puffing noise as the valves quickly close. Now, a team of biologists and acoustics experts says those sounds can serve as an early warning system for worsening water quality.
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