Last Caribou Herd On U.S. Mainland 'Functionally Extinct', Experts SayThe last herd of southern mountain caribou -- known as gray ghosts -- has reportedly dwindled down to the point where wildlife experts are calling them "functionally extinct"
15,000 Scientists From All Over The World Issue 'Warning To Humanity'Over 15,000 scientists issued a warning about the growing impact of climate change and the possibility of an extinction-level event in the near future.
100th Anniversary Of Passenger Pigeon ExtinctionSeptember 1st, 2014 marks 100 years since the passenger pigeon went extinct, something thought unthinkable until it actually happened.
Puppet Characters Are Part Of An Unsual Exhibit At The Philadelphia ZooA new exhibit opened Saturday at the Philadelphia Zoo. But they don't have to feed these animals.

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