8 of 20: This image provided by the Los Angeles Zoo and Botanical Gardens shows the lioness Cookie in an undated photo. Zoo officials said in a statement Friday that Cookie died Friday Sept. 28, 2012 at the Los Angeles Zoo, 18 months after the death of her male companion. Cookie had been under veterinary care for a month and her quality of life was diminishing quickly, so she was euthanized. A post-mortem investigation showed she had cancer according to zoo officials. (AP Photo/Los Angeles Zoo and Botanical Gardens, Tad Motoyama) (AP Photo/ Tad Motoyama)

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