Do you now the pistol shrimp ?
The pistol shrimp is no bigger than your finger and it's a crack shot. One of its two claws functions just like a handgun-and other shrimp are targets. When prey is in range, the claw is cocked.The claw snaps shut so fast, it fires a bubble bullet-up to 62 miles an hour. The bubble bursts and stuns the prey at a temperature of 4000°. It all happens in a fraction of a second...the fastest gun in the sea.
Look this video :
Source: www.nationalgeographic.com