sentence: Crabs are mixed feeders, taking algae and  shellfish such as molluscs.
sentences_before: Decapod's are an order of crustaceans in the class Malacostraca. Many familiar groups, such as crayfish, crabs, lobsters, prawns and shrimp are in this order.
sentences_after: Lobsters eat mostly live prey.
concept_name: crab
headings: Decapod