Tony the Tiger Pulled From Zoo Moat

Tony the Siberian tiger is back on display at the San Francisco Zoo after being shot with tranquilizers and hauled out of a moat where he'd spent four nights.

Zoo officials told the San Francisco Chronicle that it's not clear why Tony stayed in the dry moat. He's in good health, although he's 18 and a recent medical evaluation showed signs of senility.

Zoo officials decided on Monday that Tony could no longer stay there because excrement was piling up and it could be a health hazard.

So with the help of firefighters, they hit the 360-pound tiger with tranquilizer darts, strapped him to a board and hauled him out with a pulley.

Siberian tigers have a life expectancy of up to 20 years in captivity.