system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do flies often find their way into people's houses, but not butterflies?

I live in Ireland, if that is of any use.
gpt
There are way more flies than butterflies,  for one.   Butterflies drink nectar from flowers and lay eggs on leaves,  both of those things are difficult to find indoors.   On the other hand,  flies thrive in trash and they are everywhere,  so they get inside often.