When I got there I discovered that there were two fireplaces back to back, on an interior wall, which shared a common chimney, so the critter was going from one side to the other. This was going to be difficult. If I set up at one fireplace, the critter would go to the other side. I was debating what to do when the customer said to me, "If we light a fire in this side, won't that drive him to the other side". Customers are really smart. I never thought of that. So that's what we did. We lit a fire in one side and as we were watching, the customer went to the other room and I heard him say, "Oh, it's a..........................
Scroll down to see what the "squirrel" looked like.
It was a screech owl. I picked him out of the fireplace and took him outside. I let him go and he flew about 50 feet and fell into the snow. I went over, picked him up, and put him in a cage trap. He was probably exhausted and dehydrated from about 24 hours in the chimney. I called a wildlife rehabilitator, explained the situation, and she said to bring him over. I delivered the poor little guy, She said she would give him some raw hamburger and fluids and release him in a couple of days. A nice interesting call ended just fine.
The picture on the left is him sitting in the fireplace, and the one on the right is him sitting on the rehabilitator's hand.