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Science.Zoology.Birds.
ostrich Order Struthioniformes (Ostrich, Rhea).
 
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Greater Rhea (Rhea americana)Greater Rhea (Rhea americana) The largest bird in the Americas, the greater rhea stands about five feet tall and weighs about 50 pounds. Although the rhea cannot fly, it has very long wings, which are used like rudders when running.
Ostrich (Struthio camelus)Ostrich (Struthio camelus) The largest living bird stands up to 8 feet high and weighs up to 285 pounds. An ostrich's strong legs allow it to run at speeds of 40 to 50 mph. Those same legs can also deliver a kick powerful enough to seriously injure most any predator.
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This page was last updated on 11/02/2009.