system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are Chilli peppers so hot/spicy when the purpose of 'fruit' is to encourage animals to ingest the seeds they contain?
gpt
Birds, believe it or not, cannot taste the spices in chilli peppers, and so they eat the chilis happily while most animals leave them. Birds travel much further distances than most animals, so when they poop out the seeds the plant can spread over much greater distances.

So, basically, peppers evolved to taste good to birds and bad to animals to help their seeds spread further.