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 San Francisco Zoo Director Manuel A. Mollinedo also admitted that it was becoming increasingly clear the 350-pound Siberian tiger leaped or climbed out of its open-air enclosure, perhaps by grabbing onto a ledge.
"She had to have jumped," he said. "How she was able to jump that high is amazing to me." Mollinedo said investigators have ruled out the theory the tiger escaped through a door behind the exhibit.
According to the Association of Zoos & Aquariums, the walls around a tiger exhibit should be at least 16.4 feet high. But Mollinedo said the nearly 70-year-old wall was 12 feet, 5 inches, with what he described as a "moat" 33 feet across.
He said safety inspectors had examined the 1940 wall and never raised any red flags about its size.
"When the AZA came out and inspected our zoo three years ago, they never noted that as a deficiency," he said. "Obviously now that something's happened, we're going to be revisiting the actual height."
Mollinedo said the "moat" contained no water, and has never had any. He did not address whether that affected the tiger's ability to get out.
On Wednesday, the zoo director said the wall was 18 feet high and the moat 20 feet wide. Based on the earlier, incorrect height estimate, animal experts had expressed disbelief that a tiger in captivity could have made such a spectacular leap.
"Before I said it was impossible, that's what I've said for the last two days," Jack Hanna, a former director of the Columbus Zoo who makes frequent television appearances, said late Thursday. "But today, I don't know if I'd use the word impossible.
"I think it could be feasible for a cat that has been taunted or angered," Hanna added. "I don't think it would ever just do it to do it. Somebody had to have provoked it."
Another tiger expert remained skeptical.
"It all depends on the surface and whether they could climb up it," said John Seidensticker, head of the Conservation Ecology Center at the Smithsonian National Zoological Park. "I really don't think a tiger could spring that high. A leopard could. A leopard could in a minute."
Seidensticker emphasized that he has not seen the San Francisco Zoo's tiger enclosure.
AZA spokesman Steven Feldman said the minimum height is just a guideline and that a zoo could still be deemed safe even if its wall were lower.
Accreditation standards require "that the barriers be adequate to keep the animals and people apart from each other," Feldman said. "Obviously something happened to cause that not to be the case in this incident."
Feldman would not comment on how difficult it would be for a tiger to scale a 12 1/2-wall. But Siberian tigers are known to have phenomenal strength, at least in the wild.
"There are rare glimpses of this in the real world that suggest, when taunted, tigers can be fairly extraordinary in their physical feats," said Ronald Tilson, director of conservation at the Minnesota Zoo and the big-cat expert who sets safety standards for tiger exhibits at North American zoos.
Many other U.S. zoos have significantly higher walls around their tigers.
The animal, a female named Tatiana, went on a rampage near closing time on Christmas Day, mauling three visitors before it was shot to death by police. Carlos Sousa Jr., 17, died. Brothers Paul Dhaliwal, 19, and Kulbir Dhaliwal, 23, were at San Francisco General Hospital with severe bite and claw wounds. Their names were provided by hospital and law enforcement sources who spoke on condition of anonymity because the family had not yet given permission to release their names.
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 An attempt to reach Paul Dhaliwal on his cell phone Thursday was unsuccessful because his voice mail was full and wouldn't accept messages.
Police are still investigating and have declared the big-cat exhibit a crime scene.
The San Francisco Chronicle, citing anonymous sources, reported Thursday that police are looking into the possibility that the victims had taunted the tiger and dangled a leg or other body part over the edge of the moat. The newspaper said police had found a shoe and blood inside the enclosure.
But at a news conference, police Chief Heather Fong said police had no information that anyone had put a leg over the railing, and she said no shoe was found in the animal's enclosure. She did not address whether the victims had teased the tiger.
She said a shoeprint was found on the railing of the fence surrounding the enclosure, and police are checking it against the shoes of the three victims.
"Right now, what I want to know is if it was taunting, who did it? Why, why wasn't this protected right? I want some answers," said the dead teenager's father. As for the zoo, "They know what they did wrong, they know what they did."
Mollinedo said surveillance cameras and new fencing will be installed around the exhibit. The zoo will remain closed Friday.
At the Bronx Zoo, the tigers are surrounded by a 20-foot-high chain-link fence with a 5-foot overhang that curls inward at the top. An electrified wire runs along the inside of the fence.
The Philadelphia Zoo said it has 16-foot walls topped with a 3-foot overhang. At the Virginia Zoo in Norfolk, Va., the walls are 15 to 20 feet high with a 5-foot overhang and an electrified wire. At the Reid Park Zoo in Tucson, Ariz., the wire fence is about 17 feet.
At the Columbus Zoo and Aquarium in Columbus, Ohio, Assistant Director Don Winstel said he checked the architectural drawings and plans for the enclosure on Wednesday, and found that the walls and fence around the tigers are no lower than 16 feet.
But "now that you mention it, I think I'll take a tape measure out there tomorrow and make sure," he said.
The AZA said in a statement this was the first time a visitor had been killed because of an animal escape at an AZA-accredited zoo.
"The San Francisco Zoo is a great zoo, it's an accredited AZA member in good standing, and it has our support during this difficult time," AZA president and chief executive Jim Maddy said.
The proposed improvements, however, did little to console Carlos Sousa, the dead boy's father, although he hoped they would protect other children.
"It's too late now. It's not going to bring my son back," he said.
[Associated
Press; By JORDAN ROBERTSON and MARCUS WOHLSEN]
Copyright 2007 The Associated
Press. All rights reserved. This material may not be published,
broadcast, rewritten or redistributed.
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