Yes,but the crocs still don't have their legs directly underneath them(a strictly mammalian trait). I've seen crocs do these things. The jumping out of the water probably doesn't take that much energy. As for the launching themselves onto the shore,there is ussually a rest period afterwards. Utahraptor would have to be warm-blooded,it would take a great amount of energy to take down prey. If they were cold-blooded,then they would have to rest after the kill. This would allow scavengers to still a good amount of the food. And it would also allow bigger predators to take it as well. As for the lizards,I've noticed that smaller animals seem to have more energy than the larger ones. And,may I remind you that trying to compare modern day animals to dinosaurs may be futile. You have not shown me any sufficient evidence that dinosaurs were cold-blooded. As for the Dinosaur Heresies,I'm currently reading that.I personally believe that at least some dinosaurs were endothermic.
However, I disagree with your logic. Crocodiles can come out of the
water vertically almost their entire length to take prey. They can
make a rush up a steep bank several feet high and relaunch themselves
after getting on top. This may not apply to your definition of agile
but it does mine. My snakes are very agile at the right
temperatures. And very fast. There's many lizards even my middle son
can't catch so I know they're agile. So I don't think you can
dismiss the controversy on ecto vs endo based on activity. See
Bakker's work on reptile activity. A good textbook on animal
physiology will help as well.Michael
Caleb
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