Your scientific illiteracy is baffling me. Dinosaurs are not mammals. In what universe is a Dinosaur (from deino, Greek for terrible; and sauros, Greek for LIZARD) a mammal?
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No one knows what dinosaurs are, we just assumed they were reptiles hence dinoSAUR
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They just happen to have a skeletal structure derived from the same ancestor as all reptiles.
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Well sharks are lizards so yeah...