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This is a hierarchy of one stratum (birds) cooperating to dominate another stratum (fish).

If anything, this link shows that operating effectively within a hierarchy has clear advantages to survival.

The question was whether there were animal species that do not have internal hierarchies. I gave an example.

I don't myself believe that the question is relevant to social relations among homo sapiens, but it's better that people be aware of the variety of animal behavior.

Good ideology, wrong species

I feel like "examples in humans" was strongly implied.