Rey Mysterio is a human.
Óscar Gutiérrez ( born December 11 , 1974 ) , better known by his ring names Rey Mysterio Jr , or simply Rey Mysterio , is a Mexican-American professional wrestler . He is best known for his long tenure in WWE from July 2002 to February 2014 . He is also known for his work in Extreme Championship Wrestling ( ECW ) , AAA , and World Championship Wrestling ( WCW ) . He was the 21st person to complete the WWE Triple Crown , and was the winner of the 2006 Royal Rumble .