I came up with this sketch while I was at work. I tried to come up with various ideas for species of birds that could exist in Soaring. Birds have existed as a group of Avian Therapod Dinosaurs since sometime around the Jurassic, and while Soaring is not meant to be representative of any actual period of time in earth history it is meant to be closest to some point in the Cretaceous so there absolutely would be Bird looking Birds living at the same time as Non Avian Dinosaurs.

I wasn't looking at references of prehistoric birds while working on this, I just came up with ideas as I went.