Image: Tiger at San Francisco Zoo
AP
Tony, an 18-year-old Siberian tiger, is lifted from a moat after being shot with tranquilizers at the San Francisco Zoo. Keepers decided that Tony could no longer stay in the dry moat he climbed into last week.
updated 4/2/2010 3:24:43 PM ET 2010-04-02T19:24:43

'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 say it's not clear why Tony stayed in the 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 in the dry moat he climbed into Thursday. The excrement was piling up and officials worried about a potential 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 10 to 15 years in the wild and 14 to 20 years in captivity.

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