LOL! this was definitely a first for me! I was coming out of the bedroom and looked down and thought it was a leaf on the carpet. I leaned over to pick it up, and it hopped!! It was a tree frog!! I couldn't believe my eyes. We have nothing opened to the outside. It was very cold, so I wonder if it came up through the vent.....Although the ductwork shouldn't have any breaks in it. So..........I chased it under the bed, under the dresser, under the desk, and finally caught it. I put it outside. Hey....living out in the country you never know what to expect. LOL!