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 Her caretakers say she's having a few joint issues and her eyesight isn't what it used to be but she still looks good for an old ape.
"It's a special milestone for us," said Todd Bowsher, curator of the zoo's Wilds of Africa exhibit. "It signifies that we've made great strides in veterinary care, nutrition and animal husbandry."
The International Species Information System, which maintains records on animals at 700 institutions around the world, said Jenny is the oldest gorilla in its database.
"I think it's amazing," said Kristen Lukas, curator of conservation and science at Cleveland Metroparks Zoo in Ohio and the gorilla species survival plan coordinator for the Association of Zoos and Aquariums. "I think it's a testament to the good care that she's received at the Dallas Zoo and also the resilience of gorillas in general."
Lukas said gorillas in the wild normally would live to age 30 or 35. Health care and protection from predators has extended the lifespan in zoos.
Of the roughly 360 gorillas in North American zoos, only four are over the age of 50. All of them are female. In addition to Jenny, Lukas noted Trudy at the Little Rock Zoo in Arkansas, Colo at the Columbus Zoo in Ohio and Helen at the Louisville Zoo in Kentucky.
Jenny's keepers describe her as very sweet though a little bossy.
"If she doesn't want to go out on a certain day, she doesn't," Bowsher said. "But she really likes people."
There were plenty of them at the Jake L. Hamon Gorilla Conservation Research Center Thursday, chowing down on giant sheets of chocolate and vanilla birthday cake as they peered at Jenny through the glass.
When keepers set out Jenny's berry-topped frozen cake in a forested clearing, she slowly approached. She scooped up the fruity treat with her right hand, dug into the middle of it with her left then sat down to savor the tasty yogurt-covered remains.
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 At one point she stood, turned her backside to the phalanx of photographers and cameramen then lumbered off to enjoy her meal in peace. She wasn't about to share with her primate peers.
"It's pretty amazing that the zoo where we live has the oldest gorilla that's known," said Ben Deming, 8, of Frisco as he stared at Jenny.
Born in the wild of western central Africa in 1953, the exact date of her birth is unknown. Jenny lived with a family on the Cape Verde islands before the Fort Worth Zoo acquired her in 1957.
"I remember the day she arrived," said Nancy Hamon, 89, of Dallas, whose family bought the gorilla for the zoo and continues to be among its strongest supporters.
Jenny, a Western lowland gorilla is one of four gorillas at the zoo.
"It's a good time for the zoo," said Sean Greene, director of Community Relations for the Dallas Zoological Society.
He said the upbeat birthday party was welcome contrast to the tragedy that occurred in 2004 when another gorilla, 13-year-old Jabari, broke out of his enclosure. The 300-pound ape went on a 40-minute rampage in which he snatched up a toddler with his teeth and attacked three other people before officers shot him.
So to what does Jenny attribute her longevity? She's not saying. But her vegetarian diet couldn't hurt: seeds, cereal and one her favorites, banana peels.
[Associated
Press; By LINDA STEWART BALL]
Copyright 2008 The Associated
Press. All rights reserved. This material may not be published,
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