Snapping shrimp, or pistol shrimp, have one oversized claw on their first pair of legs that works like an underwater gun. When they snap it shut, the claw creates a shock wave so powerful it produces sound loud enough to stun or kill prey, and when thousands live together in colonies, their collective snapping becomes one of the ocean's dominant noise sources, interfering with naval sonar and underwater communication systems.

The family Alpheidae contains roughly 1,119 species spread across 38 or more genera, found worldwide from tropical coral reefs to cold deep seas. The two largest genera, Alpheus and Synalpheus, account for over 490 species between them. Most dig burrows in seagrass flats and oyster reefs, though some have adapted to unusual habitats. The genus Betaeus lives in frigid waters, while Potamalpheops remarkably survives in freshwater cave systems across multiple continents.

Interestingly, about half of all snapping shrimp species, particularly those in the non-snapping genus Potamalpheops, lack the characteristic enlarged claw entirely, suggesting the snapping adaptation evolved relatively recently in the family's history. This makes Alpheidae a study in how a single anatomical innovation can radiate into hundreds of successful species, transforming tiny crustaceans into acoustic engineers powerful enough to disrupt human military technology.