I was thinking of making this change myself. Good stuff. While we're talking about the intro, does anyone share my sense that it could benefit from a sentence or two addressing the physical characteristics of dinosaurs?  We say near the beginnning that they were the dominant vertebrate animals of terrestrial ecosystems, we say they were active and warm-blooded, and down below we compare them with birds, crocodilians, and other archosaurs... but I'm not sure that's enough. 137.54.4.225