I could use some sage backyard chicken advice. Last month, we started with a flock of 4 hens: a 15-week old Buff Orpington (now about 5 months), a 15-week old Swedish Flower (also 5 months now), 12-week old Ameraucana (now 4 months), and 10-week old Barred Rock. We lost our sweet little BR to a...