"Another extinct group of birds inhabiting Hell Creek are the Hesperornithes. Famous members of this group, like Hesperornis, are large, flightless, seagoing animals. Brodavis (Brodkorb’s Bird) however, being a small and primitive member of this group, retains wings and is still able to fly. Despite this, it still spends most of its time on the water, diving for fish."
―Saurian: A Field Guide to Hell Creek
Brodavis is a fresh-water hesperornithean avialan that lived in the Late Cretaceous period in North America and Asia. There are four known species. It was semi-aquatic like it's other relatives and presumably caught and ate fish. A unique feature that Brodavis had was its capabilities of limited flight, a feature not seen in most other hesperornitheans.
In Saurian[]
It is rumored to appear in Saurian and concept art and design ideas are known from this animal from the book Saurian: A Field Guide to Hell Creek and show the animal with a white, grey, black, and red coloration and the book states that ”however, being a small and primitive member of this group, (Hesperornithes) retains wings and is still able to fly. Despite this, it still spends most of its time on the water, diving for fish.” Also, guest artwork is featured in the book by J.W. Kirby, that shows two individuals and a young Toxochelys.
An illustration featuring Brodavis hunting baby Toxochelys in Saurian: A Field Guide to the World of Hell Creek, by J.W. Kirby.
Brodavis wingspan
Concept art of a Brodavis flying away from fighting Pachycephalosaurus and a couple of ornithomimids in the background.
Concept art of Brodavis, by Ashley Patch