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Two rare white tiger cubs have been taken to their new home at the Nicaragua National Zoo, where the playful pair will join a menagerie of rare big cat species. They were donated from a Mexican zoo, home to their parents, and are the third generation of tigers born in captivity in that country. The World Wildlife Fund (WWF) estimates that the number of wild tigers has plunged from 100,000 in 1900 to around 3,900 today.