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Appearance
Blue whales look true blue underwater, but on the surface their coloring is more a mottled blue-gray.
Diet
Blue whales' diet is composed nearly exclusively of tiny shrimplike animals called krill.
Reproduction & Lifespan
Female blue whales can give birth every two to three years.
Conservation
Aggressive hunting in the 1900s by whalers seeking whale oil drove them to the brink of extinction.
