That's probably one of the reasons that chickens and people hooked up way back when. Chickens, more than other potential bird candidates for domestication, were able to thrive on humans' leftovers and whatever else was around and available, and we also benefited (still do) from that cleaning up and utilization of scraps, and the fact that the chickens hung around and stayed available (to be eaten, etc.). The funny thing is that humans have language and culture that allows them to pass on information about what should and shouldn't be eaten (I'm paraphrasing Omnivore's Dilemna, I think) since our range of potential foods is so wide, but chickens don't... do they? They seem to know very well what to eat and what to stay away from, but it's hard to imagine what would clue them in about, say, a sucker...