"Things You Wouldn't Know If We Didn't Blog Intermittently."
Wow. Those are some claws.xkcd argues that birds are not descended from dinosaurs, they are dinosaurs. I don't know myself, but what an awesome idea.
Wayne's right. Birds are dinosaurs the same way we're mammals. Just because something looks a little different from the rest doesn't mean they stop belonging to the group. Arbitrary cutoff points are just that- arbitrary.Plus, when you go back and look at the fossils, most of the things we associate with birds showed up before birds evolved. If you consider Archeopteryx to be the first bird, the only thing separating birds from other dinosaurs (to my knowledge, at least) is that their first toe points backwards instead of being on the side of the foot.Source: I'm getting a Ph.D. in vertebrate paleontology
amazing. I go over to Guntersville Dam to watch bald eagles. Very impresssive birds. I think I saw a harpy in a zoo once. Elegant birds.
I would argue that Birds are NOT dinosaurs. Dinosaurs are large, land dwelling animals, whereas Birds are smallish flying animals. Therefore they are not the same.
Not all non-avian dinosaurs are large and not all birds are small or flying. By your argument, Compsagnathus and Velociraptor are not dinosaurs, while ostriches and Argentavis are not birds.Dinosauria is defined as the most recent common ancestor of Megalosaurus and Iguanadon and all its descendants. By definition, Dinosauria includes birds. It's a fact and not subject to opinion.
These are NOT a harpy eagle's talons! This is a photo that is from the Institute of Wildlife Studies of a bald eagle's talons and the hand in the photo belongs to Dr. Peter Sharpe, biologist for IWS.
By the way, here is a link to the original BALD EAGLE photo. http://z7.invisionfree.com/CHIL_EagleCAM/index.php?showtopic=6246
Wow - nice link. I'll update and modify the post tomorrow. Thanks, Karen.
Taxonomy is a dicey venture even with the obvious differences between one group of animals and another as grounds for categorization. Maybe Birds and Dinosaurs share a common ancestor.Suppose Dinosaurs were neither reptilian nor avian or could even share charactaristics of both. Where are the clear divisions? And why is it so important to categorize?