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Officials said sloths typically live about 20 years in the wild, and average 30-40 years in captivity.
"Paula is still fine, but you can see she is old," Jutta Heuer, a zoo curator and an authority on sloths in Europe, told Guinness. "The hair is light and not so compact. The claws grow in different ways -- the same as with elderly people. Of course, she moves slowly and is very relaxed."