Nearly a fourth of the world's mammals are threatened with extinction, a leading international conservation group said Monday as it unveiled its latest global study of the problem.
At least 1,141 of the 5,487 mammals on Earth, or 21 percent, are endangered species, the International Union for Conservation of Nature (IUCN) said at the start of its World Conservation Congress in Barcelona.
The problem appears to be getting worse since the IUCN's last comprehensive survey of mammals 12 years ago, the IUCN's Jan Schipper told CNN. But he added that more study will be needed in the coming months. 
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All About Mammals • Nature and the Environment • Global Climate Change
