This morning I found a dead mouse floating in the toilet. I have no idea how it got there and I have not seen any mouse droppings anywhere in the house. I can't even understand how it could have climbed up the side of the toilet, and if it were to leap from the tub surround, it would have to be more like a flying mouse since that is about 20" away. A friend suggested that it might have come down the vent pipe, but that extends about 2 feet from the surface of the roof and if it did wind up in the vent pipe, wouldn't it fall straight down the pipe to the main drain?