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

Size = being further up the food chain. No one really fucks around with prey larger than them, they just go after smaller easier targets. Ocean life has evolved and adapted for survivability in the ocean. Some have grown in size other have made different adaptations like being poisonous or have really good camouflage, etc.

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