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

Often extinctions in the ocean occur at the same time as those on land. Then again, the ice age extinctions lost many big animals, but not many sea faring ones.

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

A species on the brink of extinction isn't going to reverse after only 30 years.

Nevertheless so profound is our ignorance, and so high our presumption, that we marvel when we hear of the extinction of an organic being; and as we do not see the cause, we invoke cataclysms to desolate the world, or invent laws on the duration of the forms of life!

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.