Planet of the Aves: Aquabirds

In my world, instead of mammals, birds have become the dominant order. Similar to how Quadrabirds replaced the grazing mammals; Aquabirds will take up the niche cetaceans occupy.

My goal is that the Aquabird would be similar to animals like the orca or the narwhal, but I am stuck on the evolutionary process of such an animal. Considering that there are aquatic mammals, could aquatic birds exist? If so, what would they look like and how would they evolve?

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Planet of the Aves: Aquabirds

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