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Originally posted by Flawfree
I don't mean to come off ignorant or anything, but honestly how did this whole 'birds evolved from dinosaurs' thing get started anyway? Aside from pterodactyls, I don't see it
Anyway I chose the 2nd option, but I want to change my answer because humans are capable of higher thought, while dinosaurs and birds are merely capable of instinct.
And if true, I eat dinosaurs for dinner.  Me >>>>>>>>>>>>>>>>>>>
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Pterodactyls are not Dinosaurs, they're Pterosaurs.
Therapod Dinosaurs have too many anatomical, physiological and behavioral similarities to birds to be ignored. Have you ever seen an illustration of Deinonychus? It looks like an angry chicken.
Or look up Archaeopteryx. It's an early species of bird, but it still retains some of it's Raptor characteristics, like it's feet. Birds and Dinosaurs have many skeletal similarities.
Also, Dinosaurs had air sacs just like birds and that's something unique to birds nowadays. They've also compared a T Rex's soft tissue with that of a birds and came to the conclusion that Dinosaurs were more closely related to birds than to reptiles.
This is how evolution is studied. They look at skeletal remains, physiology and behavioral signs and they try to fill the gaps. With birds and Dinosaurs the connection was made fairly early, dismissed for a while, but then the theory came back into science mainstream because it couldn't be ignored.