Until this year, scientists hadn't seen the Bouvier's red colobus monkey in the wild since the 1970s.
Officials think it all started with a handful of pets discarded in Teller Lake #5.
The animals were set free after tests confirmed they were free of bovine TB and parasitic tapeworms.
From March through early April, about 600,000 sandhill cranes will stop at Nebraska's Platte river.
A camera trap meant to record chimpanzees makes a chance discovery.
Things are looking up for the world's rarest cat, whose population has doubled in number over the past decade.
Thirteen countries that are home to the world's dwindling population of wild tigers have agreed to establish an intelligence-sharing network.
The North American population of monarch butterflies has decreased by 90 percent over the past two decades. Federal regulators are now considering giving the butterflies legal protection. Continue reading →
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