Batesian Mimicry: Why Copycats Are Successful

Well, if current evolutionary theories are correct, it's not quite mimicry. It's not like one snake see the other poisonous snake scaring off predator and decides it too wants to look like that. Rather, its convergence [0] [1]. This helps with reproductive success so its numbers goes up.

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[0] the tendency of unrelated animals and plants to evolve superficially similar characteristics under similar environmental conditions.

[1] https://www.sciencedaily.com/terms/convergent_evolution.htm