system
Given the following post, respond as if you're commenting on Reddit:
human
How does a spider know to bite you, and that you are not just an inanimate object?

How does the spider know you are not just a part of it's "world," or a piece of background? Like, do they bite random things if they feel they are in danger or if it's moving and startles it?
gpt
You generally don't get bitten by a spider unless it feels threatened by you.  It won't just walk along and bite you while you are sleeping and immobile.

People are large warm objects that move about, so they are clearly not part of the world or background.  Spiders are a lot like snakes in regard to what they bite, if they can get away from it they will, if they have to bite they will, but some species often dry bite when defending and save their venom for food later.