The definitions vary (so it's hard to be exact), but they don't necessarily "live" at that density, but may only have the option to have some "yard time". I'v

The definitions vary (so it's hard to be exact), but they don't necessarily "live" at that density, but may only have the option to have some "yard time". I've seen one standard which defined the minimum number of hours per day and the diameter of the pipe through which the chickens could reach said yard (fairly similar to their own size). Equivalently and slighly tongue-in-cheek, you can go for a stroll in a park for a few minutes, and go back to the apartment. Free range.