ratite
rhea
The rheas are large ratites (flightless birds without a keel on their sternum bone) in the order *Rheiformes*, native to South America, related to the ostrich and emu. There are two extant species: the greater or American rhea and the lesser or Darwin's rhea.
WIKIPEDIA:Rhea_(bird)
pterocnemia pennata
rhea americana
rheidae
requires discussion