So here's my next build of an animal-like robot from Fay Rhodes' "LEGO© MINDSTORMS NXT: Robots Alive! Endangered Species" book: the Gorilla.
Again, Fay did an extraordinary job of implementing the animal's appearance and way of moving.
My favorite robot from the book so far!
Building time: around one hour.
Programming time: 10 minutes.
Difficulty level for children: advanced.