The sea otter acts as a keystone species in the kelp (giant seaweed) forests of the ocean in the Pacific Northwest. Sea otters feed on sea urchins, which in turn feed on kelp. Crabs, snails, and geese also depend on kelp for food, and many types of fish use the kelp to hide from predators. Sea otter populations are declining in some areas because of increased predation by orca whales. What effect will the decline in sea otters likely have on the kelp community