The chicken coop is a camp building that earns you 2Eggs 2 egg resource every hour from when you last collected it. This includes when you are offline, so if you collected the eggs at 7:23, you could collect more at 8:23, whether or not you were online during that time.

This structure also shares a unique trait with the goat pens where it spawns an animal companion in your camp; in this case a chicken. This is purely cosmetic and offers no benefit itself, aside from earning the title "Animal Lover".