I plan to do what is called a "lapbook" (a file folder with little books and pictures about a topic) with my kids for our homeschooling, and I'd like to do one on bearded dragons, both as pets and in their natural habitat. I've been able to gather little bits of info, such as the obvious ones that dragons are from Australia, their scientific name, etc., but I wondered if there was a good site that we could view. I googled it and came up with mostly basic info.
This stuff might be too advanced for what you want, but try google scholar. It might bring up some papers regarding beardies. As to informative websites, the stuff I've found is far and few in between, same as you. good luck!