A chewing noise was reported from the ceiling of this building. I went up on to the roof and found this large gap at the peak.
This is the view down the gap--rodents have been chewing the wood smooth. Since we don't have roof rats in our part of the country these are most likely gray squirrels or possibly flying squirrels.
I mostly meshed over the gap, leaving a space for any rodent inside to escape the roof and get caught in a live trap.