Is there a definite link between birds and dinosaurs?

Birds then dinosaurs or dinosaurs then birds? It's a lot like the chicken-and-egg question, only with paleontologists. Who's arguing what these days, and what are they citing as evidence?

Source: http://feeds.howstuffworks.com/~r/DailyStuff/~3/HR_fzhKZj0c/link-birds-dinosaurs.htm

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