from Wikipedia...

Originally, the main entrance on the Strip was inside the mouth of a giant cartoon-like version of MGM's mascot, Leo the Lion, but this entrance feature was changed to a more traditional entrance; many Chinese gamblers avoided the casino or entered through the back entrance, due to the feng shui belief that entering the mouth of the lion was "bad luck." In 1998, a large bronze statue of Leo was added above the entrance to keep with the MGM Lion theme, while not scaring away their more superstitious guests. The statue weighs 50 tons, and at 45 feet (14 m) tall, on a 25-foot pedestal, is the largest bronze statue in the U.S.