Like why aren’t lions total roid monsters if only the strongest male gets to breed the females?
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As a biologist with a focus on ecology/evolution, I’d like to add that I DON’T think OP is confusing physical strength with evolutionary fitness. From what I can tell, they are asking why the males don’t keep getting stronger and stronger in cases where animals fight for mates/territory. The issue is not knowing the trade-offs that go into fitness, rather than fitness itself as a concept. I’ve provided my answer in another comment.
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