system
Given the following post, respond as if you're commenting on Reddit:
human
I had to break a spider's web to get to my door. I then watched as it went up and down the leftover web strings and gather them all up in ball. Why did he do this? Can he "re-use" the string?
gpt
Some spiders will gather their webs and eat them on a daily basis.  Since spider silk is a fairly protein-rich substance, the spider can subsist off of it until prey is caught.  Since you broke the web, it was no longer of any use as a trap.  The spider collected it, ate it, and will produce another.