Armoured scavengers, swift hunters with lightning-fast punches, sessile filter-feeders and bizarre parasites: crustaceans exhibit an extensive diversity of forms. They are the dominant arthropods in the sea, but have also colonised freshwater and land. Crustaceans also gave rise to the world's most species-rich branch of the Tree-of-Life, the insects. This display contains the most well-known group of crustaceans - the crabs. Also known as Brachyura (which means "abbreviated tail"), all crabs have their rear ends reduced and most of the time curled up under the body.