We mammals, and only we mammals, have nerve receptors capsaicin triggers. Birds don’t have such receptors. They happily chow peppers and poop the whole seeds all over.

Meanwhile, we mammals, who are supposed to hate the heat because we grind the seeds to death, have happily bred hotter and hotter peppers and spread them all over the planet.

I know of no such evolutionary win-win as peppers have pulled off. Genius.