Yes, racoons can and do climb and have hands and little fingers that work as well as ours - they can open latches, etc.
As I said, hawks aren't out hunting at night but coons sure are.
Got to thinking about this hawk - maybe someone did raise it and then released it when it got too big. Poor thing probably doesn't know how to fend for itself - got lost and confused - saw some birds and bedded down with them in "bird house". The coon could have gotten the hawk as well since it too sleeps pretty heavily.
Hind sight is 20/20 but I think I would have left the hawk and waited to see how things played out. Would have been funny if hawk stayed and lived with chickens thinking it was a chicken. It would have protected it's "family" since hawks don't eat their fellow nest-mates. Would have been one for the television cameras. You feeding the hawk scraps of raw meat daily while the chickens dined on chicken feed and all of them going in to roost at night together. Hawk flying off during day and bringing back it's kill to feed it's family. A hawk for a guard? Chicken Hawk??? Anyway, funny vision playing in my head.