Teddy playing with his favorite Toy

Watch this 6 minute video of Teddy ! Teddy's favorite Toy is a small toy mouse. He throws it around, into the air and also carries it from one spot to another. Even if he loses it or we don't know where it is, he will find it and play with it again. Teddy gets bored very quickly, but when he plays with this toy - he can be busy with it for a while. What makes this toy so special?

Music (SUNNY) from https://www.bensound.com