Our Boots is quite active and loves to get behind chairs and under chairs and peek out and then leap out at non-expecting toy mice. He has quite a few fake mice in many different colors, orange and green,yellow and gray and white and black.
I recently got him a white mouse with a feathery tail. He has loss it already, as mom said he races around with it in his mouth and then laid down on the floor and played the cat and mouse game, of batting it here and there.
So I would say Boot's favorite toy is his mice.
He has balls with bells and stuffed animals, and the plastic rings off of plastic milk jugs, and cardboard rolls. But give him a mouse and the entertainment he provides is priceless.