I know it would lead to confusion in the article, but birds are classified as dinosaurs. However, there are many groups of dinosaurs and each classified by their evolutionary traits. Birds just happen to be the only group that survived to the present day. If dinosaurs are a superset of many species, birds would be a subset of them.
The interesting aspect is they found one that had evolved just enough to have a beak, but retained many of the characteristics of more primitive dinosaurs. Many dinosaurs not considered birds also had feathers, so that's not overly significant alone.
That said, countries like New Zealand had birds that went down a pretty similar evolutionary path that lived up until 700 or so years ago[1]. New Zealand is a pretty interesting place evolution wise. It answers the question of how birds would evolve if not exposed to any other major mammalian predators for centuries.