[logfromblammo]

Evolution does not plan, but it does react. Capsicum seeds eaten by birds have a reproductive advantage over seeds eaten by mammals, so a defense chemical in the fruit that discourages consumption by mammals without affecting birds is not a coincidence.

This is why it is necessary to stretch bird nets over research-breeding beds for strawberries, to get varieties more attractive to paying human customers. Otherwise, the evolutionary pressure to be attractive to birds still heavily affects the results.