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Bat that roared

Bat echolocation louder than fire alarms

10:32am, April 30, 2008

Bats using sound to find their way in the dark boom louder than home fire alarms and rock concerts, according to new measurements.

Fortunately all that noise stays at frequencies too high for human hearing, or bats would drive people batty.

Measurements of sounds from 11 species of tropical bats revealed that all an

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