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 →
The organization and its thousands of volunteers will take a census of birds throughout the Americas.
Disruption in pack social cohesion can free more wolves to mate, creating more mouths to feed in a tighter range,
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