Notes:
one of several flightless "ratite" birds that makes its living by walking and running on strong legs; weighs more that 50 pounds and stands more that 5 feet tall; uses its wings to maneuver quickly when running; defends itself with powerful kicks; also lays huge eggs in a nest that is tended by a male who may incubate as many as 30 eggs (from multiple females) at once; eats plants and invertebrate animals; altogether, the so-called "ratite" birds consist of several ancient lineages that are evolutionarily distinct enough as to warrant placement into several different taxonomic orders (Rheiformes in the case of rheas); males of this species usually are darker than females but leucistic (lighter-colored) birds of both sexes are common both in captivity and in the wild.