My two like body parts of furry mice. I house sat a dog a few weeks ago, and the dog tore apart many of the furry (large) mice, leaving just a plastic mouse and a pelt and A TAIL. They like playing with the different parts more than an intact mouse.

They also like marbles and golf balls. I have mostly hardwood floors and this old house slants in many rooms, so the rolling goes on for hours at a time - room to room. It isn't much fun to walk on the golf ball or marble in the middle of the night - or hear them being batted around!

They also love Q-tips!