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Ronaldo Souza dos Santos (born December 7, 1979), nicknamed "Jacare" (Portuguese pronunciation: [ʒakaˈɾɛ]), is a Brazilian former mixed martial artist and submission grappler who competed for UFC from 2013 to 2021. A highly regarded grappler on the world stage, Souza is a former Strikeforce Middleweight Champion, and has also formerly competed for DREAM and Jungle Fight.