What is plausible evidence supporting the hypothesis that birds evolved from dinosaurs?

The most plausible evidence that birds have evolved from dinosaurs is that the birds have the exact same bone structure as one of the dinosaur super-families, the Saurischia. In this group of dinosaurs we have the total same skeletal structure as in the birds, and most of the dinosaurs of this branch were bipedal, as are the birds, both flying and nonflying.