Ratites

 A Ratite is a large, flightless bird which belongs in the family Ostrich Emu, Cassowary, Rhea

and Kiwi .

 All are now endangered species except the Emu.  

Unlike other flightless birds, the ratites have no breastbone because they do not fly.

They can be found in the Southern Hemisphere and their closest living relatives are the tinamous

of South America.

They have many physical characteristics that are common.

They have simplified wing skeletons and muscles.

Their legs are stronger and do not have air chambers, except the thigh bone.