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The largest animal that ever lived is alive today.

Blue whales reach nearly 30 meters and up to around 190 tonnes, heavier than any known dinosaur. A blue whale heart weighs roughly 180 kilograms. Despite that bulk, they feed almost exclusively on krill, tiny crustaceans filtered from the water through baleen plates.

Useful: Size is cheap in water: buoyancy carries weight that would shatter bones on land.

Source: en.wikipedia.org

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