See a 1999 television segment that shows Alex at work with Irene Pepperberg, a psychologist who worked with him for years and described Alex not as a pet or as a lab subject but as a colleague.
Tiger paw prints found in unprotected forests in western India suggest the animals are reclaiming their old territory, but some experts doubt the evidence.
Two-thirds of the world's polar bears will vanish in less than five decades as sea ice melts due to a warming climate, a suite of U.S. government studies concludes.
The Mekong catfish travels more than 600 miles (1,000 kilometers) upriver to spawn—a discovery that means a planned dam on the river might spell disaster for the species.
Humans evolved larger brains than their primate cousins in order to develop complex social skills such as maintaining friendships, a new study suggests.
Like a creature out of a horror film, moray eels have a second set of protruding jaws that allow the fish to grip and swallow prey whole, a new study says.
A video of a baiji dolphin, which was declared "functionally extinct" just months ago, is prompting a "mission impossible" plan to gather up the last of the rare animals.
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