We just picked up two RoboRaptors for our boys.
http://www.roboraptoronline.com/

While the boys were sleeping we had to take them out and make sure they work OK

It's amazing how it interacts with its environment. It had a fight with one of our kitchen chair legs.
We haven't had the two together yet but I hear they get into quite a brawl.

Anyway these are really cool toys!

 

omigosh, how cool is that? i could use it to torment the hubby's corgi