eli5 Why are the largest animals aquatic mammals?

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I get that water helps support the whales giant weight but why did no fish become so large? Is it just a coincidence or is there something about being a mammal that helps it be large?

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Anonymous 0 Comments

Maybe because there is so much room in the ocean? 75 percent of earth is covered in water. In addition life on earth is mostly confined to being on the ground. In the ocean you’ve got hundreds of feet of depth to move around in.

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