This may sound normal to all of you, however, I'm new to this and am curious about one of my chickens. These gals are at 9 weeks now, they've been in the coop for 3.5 weeks. I started them in the top part with the run closed off for about a week or two until I gave them access to downstairs, which is closed in with hardware cloth. Well here lays the question. One of my birds, Big Bird, has been downstairs away from the rest of the flock in the mornings. Its still dark outside, everyone else is sleeping and she's just sitting in the corner by herself. She is not one that has been hanging out outside, in fact, besides the last two mornings, I've only seen her outside 2 times. She tends to hang out upstairs in the coop the most. She is a Cornish X, which i found out about two weeks ago and unfortunately will have to butcher her very soon. Is this a lazy behavior? Is her heart failing already? Help please? Thanks!