Another dinosaur that I like is Hesperornis.
https://en.wikipedia.org/wiki/Hesperornis
Hesperornis is often considered to be a bird. Even that Wikipedia article describes it as a bird. Despite this, scholarly sources (including the ones cited by Wikipedia) make it very clear that this animal was not part of crown group Aves. It was part of the stem leading to birds, though this does not make it a bird. People should call this creature a birdlike feathered dinosaur in my opinion. We only call this thing a bird because some people still don't want to see the evolutionary connection between bird and dinosaur. If we are going to call Hesperornis a bird, then we need a stricter and more scientifically rigorous definition of what is and is not a bird.
Anyways, Hesperornis was convergently similar to penguins. Even among feathered dinosaurs, there was tremendous diversity.
The Hesperornithes clade went extinct at the end of the Cretaceous, along with other non-bird dinosaurs. In other words, there were some dinosaurs that were very close to birds on the tree of life, but still didn't make the cut.
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