Reality and Rebirth: Beaster Egg
You found a Beaster Egg!
This is my cat. His name is the Unauthorized Beast.
He had a difficult time learning how to pull open doors that were opened a crack; he would just push them shut and cry for help. He learned when we closed him in a room with a door that didn't latch, thinking he wouldn't escape because he would have to pull it open. He did pull it open, and started getting in the way of Moving Large Furniture.