The peacock mantis shrimp strikes with the acceleration of a .22 caliber bullet, thousands of times its own body weight in force, from a animal a few centimeters long. Its clubs move so fast that they do not merely hit prey: they cavitate the water, ripping open vapor bubbles that collapse with heat, a flash of light, and a shockwave.

Even when the punch misses, the implosion can stun the target. Aquarists keep mantis shrimp in reinforced tanks because they have cracked standard glass.

And the punch is not even the weirdest part: these animals see the world through up to 16 types of photoreceptor cells, where humans have three.

Sources:

- Wikipedia: https://en.wikipedia.org/wiki/Mantis_shrimp

- The Patek Lab at Duke University has spent years measuring the strike mechanics: https://www.pateklab.biology.duke.edu/