Our three chickens usually have the run of the back yard and they love digging around for bugs and worms. It's what they do all day really. Since we've had them, it's been kind of nuts seeing how much broken glass and random trash we have buried in our yard. One neighbor actually said our neighborhood used to be a landfill way back when--maybe that's the problem.
Sometimes the chicken's find really rad things like this Dick Tracy badge:
Sometimes the finds aren't so appealing. Last week they dug up a dirty old syringe in one of the flower beds! Thankfully, it was clearly old and not the recent refuse of some neighborhood drug addict. Still disgusting.