Jen, thank you for the back up, but I have to disagree with your comment about "NEVER" mixing species.
In the case of Dragons and Uros, it would not work because they are from substantially different places and have different requirements.
Although...
With delicate care and consideration, time and effort, resources and research, community vivariums have been created and housed many species together very hapily. I would not suggest it for begginers, but if a herpist had the drive and commitment to do it, I would encourage them.
In the future I plan on doing this and I did much reasearch into how to do it correctly. However, I opted to postpone any thoughts about setting one up until I became familiar with each individual species I may be including in the community, before they were put together. Next week I will begin this task by picking up a pair of Chameleons.