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Date:10/21/2014 10:11:45 PM
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Hi Hulk
Today I'm going to answer a few questions that have come up about the dinos, and tomorrow we'll get back to the tour. First of all, the Mesozoic, the age of dinos, can be divided into three eras: the Triassic, 251 to 200 mya(million years ago); the Jurassic, 200 to 146 mya; and the Cretaceous, 145 to 66 mya. Dinosaurs evolved in the mid Triassic, along with mammals and reptiles(about 225mya).
Someone asked about big dinos having 2 brains, and that is not true. If it were, we'd be considered 2 brained animals as well. At the base of the spine, near the tail, most dinos had a bunch of nerves, just like we do. These nerves serve the lower extremities, just like ours. It's not a brain, it's more of a bundle.
Next: all birds are dinosaurs, but not all dinosaurs are birds. Think of it this way: all toads are frogs, but not all frogs are toads. It's probably a good thing these huge sauropods couldn't get off the ground, right?
Did feathers evolve for flight? No, they evolved long before flight occurred, so they probably evolved for warmth!
And finally, are pterosaurs considered dinosaurs? The answer to that is a resounding NO. Pterosaurs, like dinos and crocodiles, are archosaurs, but they are cousins at best to the dinos. We'll talk about that more later. Just know for now that they are not dinos, just as plesiosaurs and mosasaurs are not dinos, they are aquatic reptiles.
If you have a question, feel free to ask. I'll do my best to answer. Thank you for the vote, back to the tour tomorrow. Here's a big hug and vote for you, Gizmo
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