Chicken sharing, chicken clubs, coop-building parties, and all kinds of people who are really putting the "coop" in "cooperative."
Chicken sharing actually makes a lot of practical sense. Let's say you, like most people, eat eggs, and you are thinking about getting chickens (and by that, I really mean hens; roosters make noise, not eggs, and they are often illegal to keep in high-density residential areas). If you live in an urban or even suburban area, this could meaning devoting a significant portion of your yard to building a coop and giving the chickens a little free range. Many people wouldn't go to all of this effort for just one or two chickens. But what if you get 15 chickens, have a coop building party with seven of your neighbors, and start taking turns caring for the chickens? You could even take down part of a fence so that the chickens can have more space to roam into your neighbor's yard. Each neighbor is assigned one day of the week to feed the chickens and collect eggs.