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Ecology: How do they interact with their environment? How do they feed? How do they move? Are they colonial? · Larger crustaceans (shrimp, lobsters, and crabs) are used as food throughout the world, and are therefore important to human economies
   · Small planktonic crustaceans, such as copepods, water fleas, and krill, are a major link in the marine food chain between the photosynthetic phytoplankton and larger carnivores such as fish and whales
   · Others are crucial in recycling nutrients trapped in the bodies of dead organisms · Crustaceans eat: o Many crustaceans are scavengers, feeding on scraps and dead creatures. o Crabs, shrimp, and prawns search for food mainly at night and hide in crevices by day. o Some crabs and lobsters are active predators, seizing prey in their powerful claws. o Barnacles filter tiny creatures from the water using their hairy legs. o Woodlice munch on plant remains · Crustaceans can be found traveling in groups or individually · Move in various ways o Crawl o Swim
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