This Maran rooster is 7 months old. He eats crumble, scratch grains, and mash. He is housed with 3 other Marans and 4 Ancona ducks in an outside pen. They have straw to lay and scratch around in their pen, no coop, just a 3 sided pallet shelter. He's been off the roost for a few days, now the darker comb, and is lethargic. It has been a bit rainy. Any thoughts?