[keithtoo]

I've actually heard of some ancient dinousars and Pterosaurs which have unexplained cavities in their skull which literally could have held some chemical that could have been expelled thru their nostrils or mouth that could have had a "smoky" effect.

Then again, anyone exhaling in a cold-enough environment, gives off breath as 'steam'. Of course, most cold-blooded reptiles dont last long in cold climates, but some do.

[Don Joe]

"I've actually heard of some ancient dinousars and Pterosaurs which have unexplained cavities in their skull which literally could have held some chemical that could have been expelled thru their nostrils or mouth that could have had a 'smoky' effect."

Ever hear of the Bombadier Beetle? It combines hydroquinone (a photographic developing agent and a rocket fuel) and hydrogen peroxide. The result is a loud stinky smoky detonation.

[Johnny Shear]

Of course, most cold-blooded reptiles dont last long in cold climates, but some do.

What about all the turtles on my lake here in Indiana? Gets pretty cold here. I assume they can live here because they burrow into the ground (Assuming again) in the winter?