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The last desert bighorn sheep that roamed the mountains above Tucson, Ariz., died in the 1990s, the victim of human encroachment, mountain lions, and fire suppression. Now, the iconic Southwest animal — picture the Dodge Ram’s grille — is back. A herd of 31 was released Monday morning after being transplanted over the weekend from the Yuma area in the far west of the state. Why would the sheep survive this time?