|Photo by Mark Hengesbaugh 5/27/2013|
Osteoderm. For everything you wanted to know about Gila Monster anatomy and morphology, take a look at this site.
Warning: Section on 'inner organs' shows actual inner organs. If you aren't up to a look inside, don't scroll past 'limbs.' The section on scales will give you the word-of-the-day definition. Don't try any of this at home.
Thanks to Mark for the photo and link.