Archaeologica.org

http://www.guardian.co.uk/science/2009/ ... pod-mexico

and already feathered they claim.

Roy.

Not to mention.....

Examination of the fossils revealed air-filled sacs in the bones, a feature that links the dinosaurs with the evolution of birds much later.

So it looks like proper dinos, dino-birds, and mammals all developed around the same period: approx. 220 to 250 mio BP.

What was so special about that period that it gave rise to the emergence of these three major fauna classes?

What was so special about that period that it gave rise to the emergence of these three major fauna classes?

That's a damn good question RS! I wonder indeed.

Roy.