Saw this video on this blog and thought I'd share it with you all. I showed it to the kiddos, and they were pretty intrigued. This would go great with some of the picture books about Chameleons that are available.
Oh, and of course, there is always the possibility that this video is a total fake (I don't think cameleons can really change color so dramatically); even still it's pretty entertaining to watch, and it still teaches the idea of camoflauge! ;)