Scientists at University of Manchester used micro-CT scanning to look at what happens when a caterpillar changes to a butterfly. Very neat 3D images. The first link is a short article, the 2nd link is a youtube video. The final link is the full article
http://www.cnet.com.au/3d-scanning-reveals-the-metamorphosis-of-a-butterfly-339344305.htm
http://www.youtube.com/watch?v=GxyZSzs7Seg&feature=player_embedded
http://rsif.royalsocietypublishing.org/content/10/84/20130304.full
http://www.cnet.com.au/3d-scanning-reveals-the-metamorphosis-of-a-butterfly-339344305.htm
http://www.youtube.com/watch?v=GxyZSzs7Seg&feature=player_embedded
http://rsif.royalsocietypublishing.org/content/10/84/20130304.full