-colored sheen; giving the blue whale its nick-name of "sulfur bottoms". Other names include Sibbald's Rorqual and Great Northern Rorqual. Blue whales (like all baleen whales) are seasonal feeders and carnivores that filter feed tiny crustaceans (krill, copepods, etc), plankton, and small fish from the water. Krill, or shrimp-like euphasiids are no longer than 3 inches. It is amazing that the world's largest animals feed on the smallest marine life. Blue whales are gulpers,
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