A bust of Gastornis geiselensis, a six-and-a-half-foot tall relative of the modern Anseriformes - ducks and allies - and scourge of small horses all over Eocene Germany. Not really though, Angst et al. have pretty confidently proven that it spent its life crushing large seeds rather than small mammals, to the disappointment of 12 year old dinosaur enthusiasts around the world.
Ey you wanna dish out some discourse on the big birds of the post K-T world? Specifically the unrelated terror birds, The Phorusrhacids and the less terrible Gastornids?