Also, this is super pedantic and should be ignored, but I thought the scientific community agreed that dinos weren't reptiles?
"Reptile" is no longer a useful term for taxonomists. The old clade "reptilia" is based on traits, not on ancestry, an outmoded means of classification. The most useful grouping when discussing reptiles is the class "Sauropsida" which is the only grouping that includes all reptiles but excludes mammals. The class also includes birds, and their ancestors, dinosaurs.
Spoiler
[img]http://upload.wikimedia.org/wikipedia/commons/b/bb/Reptilia-Sauropsida.jpg[/img]
Above is an illustration of the problem. Blue is the old "reptile" clade, which included ancestors of mammals and excluded avians. In yellow is the class Sauropsida, which makes much more sense.
Of course, this has very little bearing on the world in TES, since creatures change into other creatures at the whims of god-like beings and malevolent psychic trees.