Photographs of Terrorbird head, extinct Moa full skeleton and Elephant Moa leg bones, Terrorbird head, 

Extinct paleognathes group of ratites and tinamous, believed to be most closely related to the dinosaurs, especially the branch of velociraptors and Tyrannosaurus rex.
Phorusrhacos longissimus head, Dinoris skeleton and Dinoris elephantopus skeleton leg.

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Other ratites (which evolved into large, flightless birds such as the emu and rhea) are on the following page.

Courtesy of the University Museum of Zoology, Cambridge