A species of caterpillar develops toxic spikes that deter the birds that prey on it. Over time, the genetics of the bird population shifts so that an allele for a digestive enzyme that neutralizes the toxin becomes more common. This is an example of

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This is an example of coevolution, where two species influence each other's evolutionary path. The caterpillar develops a defense mechanism, and in response, the bird population evolves a counter-adaptation.

A Species of Caterpillar Develops Toxic Spikes That Deter the Birds