The first part means some people try to compare dinosaurs to reptiles we see today like crocodiles because they look the same. “We need to turn to birds” means we need to learn about them to learn more about dinosaurs. “Oldest known bird” means the oldest bird they could find in history. “Yielded” means made it produced. The last sentence says that some fossils they found from a long time ago look like they could have feathers
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