I found this really interesting, it's for a turtle but I assume the process is similar.
You can see it moving, my goodness I wouldn't be able to contain my excitement!!
http://www.youtube.com/watch?v=creN1Y8I1vE
You can see it moving, my goodness I wouldn't be able to contain my excitement!!
http://www.youtube.com/watch?v=creN1Y8I1vE