Photographs of Rhea, Cassowary, Emu and Tinamou skeletons, in the Aves (Birds)

Palaeognathes group of ratites and tinamous.
Rhea americana skeleton, Casuarius casuarius skeleton, Dromaius novaehollaniae skeleton and Rhynchotus rufescens skeleton.

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These often flightless birds are thought to be amongst the first to evolve from dinosaur relatives via the Palaeognathes (including the Elephant Moa and Terrorbird)

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Courtesy of the University Museum of Zoology, Cambridge