| http://www.w3.org/ns/prov#value | - Oct 28, 2011 The populations of lions, tigers, leopards, cheetahs and other big cats have decreased dramatically in the past 50 years and experts warn that they may die out altogether in the next 20 if nothing is done to stop it, USA Today reports.Many of these cats are national symbols, but also play an extremely significant role in their respective ecosystems as predators, the news source report
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