That pistol shrimp that makes tiny explosions

By Warren Hamilton Category: The Animal Kingdom 19th March 2026

Right, picture this: a little shrimp, not even one of them showy ones, but a proper modest crustacean with a big attitude. It has one claw built like a miniature crossbow. When it wants to, it snaps that claw shut so fast the water cannot cope and it makes a cavitation bubble. That bubble then collapses and goes bang. Proper tiny explosion, in the sea.

Now don't laugh, what sounds daft is basically physics weaponised by a shrimp. The snap produces an enormous pressure wave and a flash of light for a split second. Scientists have measured the noise up near sound levels you might expect from a gunshot underwater, and the collapsing bubble can briefly reach temperatures of thousands of degrees. It is there and gone in a blink, but while it happens it will stun or even kill small fish and crabs. Job done. Lunch served.

These are called pistol shrimp or snapping shrimp, family Alpheidae, and they use this trick for hunting and for scaring off rivals. Some species even live with goby fish, keeping watch and doing the heavy nipping while the goby acts as a look-out. You could say it is the crustacean version of a dodgy neighbourhood alliance. Handy, innit.

What I love is the mismatch: a creature the size of your thumb packing a weapon that makes light, sound and heat, all from a pocket-sized claw. Reminds me of people I grew up with who wore big coats and had alarmingly strong handshakes. The shrimp can also regrow the claw if it loses it, so it is resilient, like those folk who keep coming back to the pub despite never having any money.

So next time you think nature is all butterflies and calm BBC voices, remember there is a shrimp out there snapping like a bloke popping balloons with a shotgun, creating brief mini-suns underwater and getting its tea sorted. Proper weird and brilliant, that is.