Ichthyornis
"There's a conception that different birds emerged from different dinosaurs, that there are, say, ostrich dinosaurs, and that's where ostriches evolved from," Martyniuk said. "But when you get down into the nitty-gritty anatomy, all modern birds probably evolved from something like Ichthyornis, a generalist seabird that managed to make it through the big extinction at the end of the Cretaceous."