Or cold-blooded species like snakes, gators/crocs, turtles, lizards, etc. Maybe not provable, but it is likely that at least some dinos were warm blooded, but only the birdlike varieties survived the cataclysm, to become today's birds.
I believe in God and his creation, but not that it is only thousands of years since He did it.
Doesn’t God say in Genesis, “Let us take this matter unorganized...”? I haven’t read the Old Testament in a year, and I’ve slept since then, so I forget.
That tells me that not everything was put together in its pristine form at the same time.