The LEGO NXT Turtle 2.0 is the evolution of the LEGO NXT Turtle I built with the NXT retail set 8527, described in my book. This one can be built with the NXT 2.0 retail set 8547. It can walk around and turn, can retract the head when it’s scared and has a new crazy feature: it can lay eggs!
You can download the building instructions and the NXC program for this robot if you know the password, that is the second word of the section “Autonomous Behavior Simulation” of Chapter 6 (page 217) of my book “Creating Cool LEGO MINDSTORMS NXT Robots”.