system
Given the following post, respond as if you're commenting on Reddit:
human
How do spiders know where to build their webs?

Do they have any way of knowing where bugs generally fly? Is the one in my bathroom exceptionally stupid or is it just unlucky?
gpt
They put out streamers, test threads, and then go away for 48 hours (more or less depending on species). When they return, if the streamer is still intact, its safe to build a web there...if a bug is trapped in it, its a great spot to setup a web.