Chicken Cribs

This seems like a super easy way to keep chickens without needing a lot of room.  They do look kind of small for multiple chickens, but even if you were to make them a tad bigger, they still wouldn't take up much space.

These pens, or cribs, are predator proof, easy to assemble, and ideal for urban settings.  Each one can house 2 to 3 chickens.  The handles on the side make it easy to move around the yard.  Here's the full article:

http://www.coolhunting.com/design/chicken-cribs.php