Alpheidae (pistol shrimp) only grows to about 3–5 cm. It has a claw larger than half its body size designed like a gun. When used, it snaps emitting an enormously powerful wave.

Where this gets stranger:

The claw creates a cavitation bubble:

• The cavitation bubble reaches temperatures of over 5,000 K (4,700 °C)
• Generates acoustic pressures of up to 80 kPa
• The bubbles reach speeds of 62 mph
• It releases sounds reaching 218 decibels
• The pressure is strong enough to kill small fish
• It also produces light (not visible to the naked eye)