Mantis Shrimp Can Punch at the Speed of a Bullet

The incredible power of the mantis shrimp's strike comes from a specialized system of biological springs, latches, and levers, allowing it to strike far more swiftly than with muscle power alone. This mechanism allows the "smasher" type of mantis shrimp to accelerate its club-like appendages at over 10,000 times the force of gravity, reaching speeds of up to 23 meters per second. The force of this punch is so immense that it is comparable to that of a .22 caliber bullet, delivering a blow over 2,500 times the shrimp's own body weight. To protect itself from these self-inflicted impacts, the dactyl club is a multi-regional composite made of mineralized chitin, the same material found in the shells of insects and crustaceans.

This blistering speed creates a phenomenon known as cavitation. As the appendage whips through the water (Review), it creates an area of low pressure, forming a small bubble of vapor. The subsequent collapse of this cavitation bubble generates a powerful shockwave, essentially a double punch that can stun, dismember, or kill prey even if the initial strike misses. This collapse is incredibly energetic, producing a flash of light and temperatures reaching approximately 4,400 degrees Celsius, which is nearly as hot as the surface of the sun.

Mantis shrimp, or stomatopods, are an ancient group of marine crustaceans that are only distantly related to crabs and lobsters. There are two main types of mantis shrimp, distinguished by their claws: "spearers" and "smashers." Spearers have spiny appendages designed to stab and snag softer prey, while smashers possess the more developed, club-like appendages for bludgeoning and breaking open the hard shells of their prey, such as snails, crabs, and mollusks. The unique structure of the smasher's club, with its herringbone-patterned outer layer, has even inspired the development of stronger materials for body armor and aircraft.