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Whales are believed to have evolved to become the largest creatures on Earth because their biggest, most fearsome predator - the 50-foot-long
Megalodon shark - became extinct at the beginning of the Ice Age.

Whales are believed to have evolved to become the largest creatures on Earth because their biggest, most fearsome predator - the 50-foot-long Megalodon shark - became extinct at the beginning of the Ice Age.