Efficiency. Environmental adaptations?
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Those are tautological.
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Blue whale is biggest animal ever?
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Ocean and island animals are considered exceptions iirc. https://en.m.wikipedia.org/wiki/Deep-sea_gigantism …
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One (or some) ancestor were larger. Plenty versions were smaller as well. Evolutionary optimization if you will. But then again who's to say the present ones are the final version?
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Fossil survivorship bias
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That doesn’t affect max size inference. It’s obvious that the largest big cats in the past were larger than the largest ones today, regardless of smaller ones whose fossils didn’t survive for eg
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Seems more like survivor bias: bigger animals are more likely to fossilize and/or we like to talk about them more.
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Doesn’t affect the maximum limit size though
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