Pistol shrimp
Image by The Hantu Blog
Also known as the Snapping shrimp, some species share burrows with goby fishes in a symbiotic relationship. The burrow is built and tended by the snapping shrimp, and the goby provides protection by watching out for danger.
The snapping shrimp competes with much larger animals, like the sperm whale and beluga whale, for the title of ‘loudest animal in the sea’. The shrimp snaps a specialised claw shut to create a sound wave that generates pressures of up to 80 kPa at a distance of 4 cm from the claw. The pressure wave is strong enough to kill small fish.