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Characteristics of Crustaceans (1:13)
Crustaceans are arthropods that live in water and have jointed exoskeletons.
World of the Estuary: Bottom-dwellers (2:05)
Bottom-dwellers predominate in estuaries. Most are filter-feeders that strain water to obtain food. They also use different strategies to deal with the fluctuating estuarine environments.
World of the Estuary: Clams (1:19)
Clams are common, bivalve (two-shelled) bottom-dwellers with tubular siphons that retrieve food and oxygen for respiration. They also create jet propulsion for burrowing, helped by a fleshy foot.
World of the Estuary: Commensals (0:47)
Animals that share habitats with others are commensals. Examples include: clams, cusk eels, ghost shrimp, and clamworms.
World of the Estuary: Oysters (0:41)
Oysters are bivalve mollusks with shells shaped according to how crowded they were as they grew.

