The animal snaps a specialized claw shut to create a
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bubble that generates
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of up to 80 kilopascals (12 psi) at a distance of 4 cm from the claw. As it ejects from the claw, the bubble reaches speeds of 25 m/s (90 km/h; 56 mph).
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The pressure is high enough to kill small fish.
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It corresponds to a peak
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of 218
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relative to one
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(dB re 1 μPa), equivalent to a zero to peak source level of 190 dB re 1 μPa m. Au and Banks measured
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source levels between 185 and 190 dB re 1 μPa m, depending on the size of the claw.
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Similar values are reported by Ferguson and Cleary.
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The duration of the click is less than 1
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.