Science fact changes with better evidence.
Crocs and sharks were around when dinosaurs were, and are older.
Bigger versions of course.
A microscan of T rex fossil leg bones reveal a spongy structure unique to birds.
Fossil feathers have been found with dinosaur fossiles.
Knee joints are distinctive and unique to dinosaurs and birds.
Dinosaurs are extinct, but their descendents appear to survive.
That is the current belief, which would suggest those with that lineage may have been warm blooded.
There were other large animals then, now extinct, that were not dinosaurs.
Yeah I saw that about the t rex bones, but I thought I heard on one of those shows that they said they still were not 100% sure dinosaurs had ANY modern day relatives and they may have been totally unique creatures, but the images of dinosaurs we see today share alot in common with birds, I wonder if t rex had feathers instead of scaly skin? I know sharks and crocs have been around that long, and basically only got a little smaller over time, sharks I think got a whole lot smaller, as wasnt megladon the size of a freakin super oil tanker back then? I could not imagine a shark that size!!! I have been around a shark once in my life in the ocean (small one)and they are nothing but killing and eating machines, there is no compassion or thought other than food in its mind, I could not even imagine coming face to face with a 30ft great white today!!!