by Mitera Nikkou » Tue Mar 27, 2007 2:45 pm
I think it's possible. After all, they have found that the tyrannosauridae had hollow bones, and it hadn't been the only dinosaur to have that trait. I think that there have even been some genetic similarities found between some dinosaurs and modern birds.
I think it was much less due to size and instead other factors. A lot of mammals came out of that time period because more resources were available to them. Plenty of dinosaurs could have handled the colder temperatures, many of which actually had features to more easier absorb heat from the sun. The thing about that, was that the lack of vegetation effected the carnivores more than the herbivores. It literally robs the food chain from the top to the bottom even though it starts from the bottom and works its way to the top. So, in the end, what moderately-sized to large, meat-eating dinosaurs that there were, found less prey because their numbers were lessened due to the lack of vegetation, and so more attention was turned to prey that they'd rather not go after due to the higher risks. So while they eat each other, decreasing their number in that way as well as being a victim to environmental factors, the mammals eat what vegetation they can find and not eat each other... Although I'm sure flesh was scavanged when the need arose; I'm unsure if there were many, if any, carnivoric mammals back then.
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