Which animals eat crustaceans?

Besides humans, which eat crustaceans by the plenty, there are many other animals that eat crustaceans.  Krill is the basis for the marine ecosystem in the Antarctic and baleen whales, fish, squid, and small birds eat them.  There are a few types of gastropod mollusks and other predators that feed on barnacles.  Crabs, lobsters, shrimp, and crayfish are eaten by many other animals.