Hagfish, a sleeper shark, and other scavengers arrive to feast on the carcass. Meanwhile another gray whale carcass has sunk to the bottom of the deep sea.Along the coast of California, a migrating gray whale and her calf are targeted by a pod of orcas, who hunt down and kill the calf.In addition, their eggs are nutrition for many, both above and in the sea. Herring initiate the most productive food chain, providing sustenance for humpback whales, and Steller's and California sea lions.Lunar phases can also have a bearing on events and the mass arrival of Ridley sea turtles on a Costa Rican beach is shown.Phytoplankton forms the basis of all sea life, and every night some 1,000 million tonnes of creatures ascend from the deep to search for food.These feeding grounds have led to the world's largest albatross breeding colony, on Steeple Jason Island, west of the Falklands.
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