Finally, I have found time again to resume my review of Fay's new book "LEGO® MINDSTORMS NXT Robots Alive! Endangered Species". After the NXT Frog, I've built the Komodo Dragon:
Being somewhat fragile and delicate in regard to the type of underground it is running on, the model is a very nice and elegant implementation of a reptile and mimics wonderfully the particularly reptant pace of this kind of animals.
Building time: app. 30 min.
Programming time: 3 min (the program is very simple)
Difficulty level for kids: medium