Niobrara
Pteranodon, Geosternbergia, Nyctosaurus, Ichthyornis, Hesperornis, Styxosaurus
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Bird’s escape from marine predator recorded in fossil
This particular bird's narrow escape provides insight on Cretaceous food chain. See more at Earth Archives.
Source: eartharchives.org
I was surprised to see that Hesperornis could be almost as big as the average human, wich also puts it around the same size as a female Pteranodon (minus the latter's wingspan). Following recent research on pterosaurian competence underwater, here's a female Pteranodon being harassed by two much more agile Hesperornis into giving up on her fish.
Probably the most aquatic bird that ever existed, Hesperornis regalis doing it's best inpersonation of a loon, or grebe, or both.