Rhea is incorrectly written, and should be written as Nandu (tilde). being its meaning: the correct term is Rhea (leading tilde). The Rhea is a bird similar to the ostrich, but smaller and is of American origin. It also receives the names of sori, suri, rhea or Rhea. Its scientific name is Rhea americana and belongs to the family Rheidae. It is one of the fastest animals in the world. Their young are told charitos and juveniles, charavones. The word Rhea is the guarani language and means spider.