A police officer examines a tiger enclosure at the San Francisco Zoo the day after the Christmas Day 2007 attack. A tiger escaped from the grotto and attacked three people before police shot and killed it. A new zoo accreditation report said there were too few workers on hand at the time of the attack because most had been sent home early due to the holiday. (Noah Berger / Associated Press)
A police officer approaches the San Francisco Zoo after the tiger attack. A report by the Assn. of Zoos and Aquariums said the overall response by zoo personnel to the Christmas Day 2007 attack was “impressive,” but its security supervisor was criticized for doubting the two brothers who initially reported a tiger’s escape and its attack on them and another person. (Noah Berger / Associated Press)
Leigh Lawson, 25, in front of the San Francisco Zoo the day after the tiger attack. She was protesting the killing of the Siberian tiger that escaped its habitat and killed a zoo visitor. Lawson, a student at Humboldt State, says she wishes officers had tranquilized the animal instead. (Noah Berger / Associated Press)