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It's a shrimp that has a club, but they think the bubble and consequent shockwave
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Mantis shrimp....affectionately referred to as "thumb splitters" in the reef-aquarium hobby
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Because they strike so rapidly, they generate air bubbles between the appendage and the striking surface-known as cavitation bubbles.[9] The collapse of these cavitation bubbles produces measurable forces on their prey in addition to the instantaneous forces of 1,500 newtons that are caused by the impact of the appendage against the striking surface, which means that the prey is hit twice by a single strike; first by the claw and then by the collapsing cavitation bubbles that immediately follow.
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...wiki