If you grew up on a farm, had to visit a farm every summer because that's where the grandfolks lived, had to learn at any point in your life how hard real farm work is, then your first thought when you heard about the urban backyard chicken fad was that the city folk would never stick with it. "Those slickers," you may have thought, "will ditch those chickens the first time they want to fly the coop and go off surf sailing in the Virgin Islands." Well, no. If they're responsible poultry-raising urbanites, they'll hire Urban Chicken to send out a highly trained chicken tender who will feed, water, clean up and collect the eggs. About the only thing Urban Chicken's sitters can't do is teach those feathered friends to play tic-tac-toe. Not yet.