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Sonar causes rock-concert effect in dolphins

Study finds temporary hearing impairment in a bottle-nosed exposed to recordings of ship pings

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7:01pm, April 7, 2009

Exposing a bottle-nosed dolphin to a couple of minutes of nearby sonar pinging could cause some temporary hearing impairment, a new test finds.

What sonar does to marine mammals has become a hotly debated topic in recent years, as beaked whales and other species have stranded in shallow water and died after naval training exercises in the area.

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