At the end of the Cretaceous, though, oceans were changing and this was non related to the land extinctions caused by disease.

To me it seems that the warm blooded dinosaurs replaced advanced mammal ancestors that were warm blooded, also.

Feathers predate birds.

Also, while I was at Yale, I had a job teaching kids at the museum.

When looking at the evidence of feeding on large prey, you can see every size tooth from hatchling to adult in one spot. The babies may have been fed in the nest until they were full grown, like in eagles and hawks.

Land bridges were everywhere during the extinction, many species were spreading, and there were many diseases.

I do point to disease. When big animals are spreading and mixing extinction occur. You can see this with elephants.

After that I left for Johns Hopkins University in Baltimore, where I taught anatomy to pre-med students. I left that job in 1982.

Stegosaurus was common only on well drained, dry soil.