This is a Lego Ev3 squirrel, and I built it because I haven't seen many Lego animals that are fully interactive, so I thought to build it. I think kids will love it because it's like a companion. The program makes it able to chatter when you rub it's belly, and bark angrily when you touch it's tail sensor. I have found this moc very fun to play with, because it waits for user input, unlike other robots which are constantly going, and that motor whine is sort of annoying, where you can just set this guy next to you and rub his belly when you want. This model is compatible with the ev3 rechargeable battery.