I own four mature red sex link hens and I plan on getting a rooster in the future. Currently the four girls reside in a small roughly 10 foot by 10 foot pen with the added benefit of my free ranging them for a few hours every day. This free-ranging cycle is starting to be inconvenient and so I decided to upgrade their run so I don't need to do it everyday. So here's my question, their new run is measured out approximately 25 feet by 25 feet with some soft dirt ground, hard dirt ground, shrubs and immature trees, tall field grasses and shorter regular grasses. Now for five birds, is 625 square feet sufficient for outdoor space and access to bugs, plants, etc... That means there will be 120 square feet per bird. I've read that 10 square feet per bird is sufficient enough however I noticed that many people were mixing up ft squared by sq feet. If it's by ft squared there will be five ft squared per bird which equals 120 square feet. So when I see ten sq. ft per bird, does that mean the area should have a 10x10 perimeter or 10 square feet of area?