I've never seen or heard that birds and reptiles we're being placed in the same class. I don't understand that at all. I know that with DNA testing there is a lot of reclassification of species, genera, and even families, but classes? I don't understand that. I mean, one is cold-blooded and the other is warm blooded. Some dinosaurs and birds are placed together, but it's believed that some dinosaurs were warm-blooded.
I'll have to do some research on that idea. At any rate, thanks for bringing this up.