rhe·a 
(rēə)
(rēə)n.
Either of two large flightless South American birds, Rhea americana or R. pennata (syn. Pterocnemia pennata), having gray-brown plumage, a long neck and legs, and three-toed feet.
[New Latin Rhea, genus name, probably from Latin, the wife of Cronus; see RHEA.]