I forgot what I learned about it in school. It was something about the pelvic bone I think, but was that it? DinoData - The Genius Who Wanted to Be a Dinosaur by Steve Brusatte::
It is generally accepted that birds evolved from some sort of small dinosaur, likely during the Early Jurassic. However, this hypothesis was "threatened" by
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It is not assumed that they are related. In fact, it was initially assumed that they were not related. However, the evidence shows that they are related.
Primarily, that evidence is in the form of fossils of dinosaurs with feathers. There have been recent finds of even less bird-like dinosaurs, dinosaurs from the velociraptor family, that have feather quill spurs on their forearm bones.
There are also similarities in the bone structure, as you mentioned.
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Why is it assumed that dinosaurs and birds are related?