Earth looked much different not just millions, but even decades and centuries ago. Many animal species that once existed are ...

The United States has the most horses in the world, with a population of more than 10.3 million animals. That's roughly 18% of all horses. The country is also home to more than a hundred registered ...

Every American red wolf alive right now is descended from only 14 canids. In the 1970s, humans drove the red wolf to the brink of extinction.... The American red wolf is endangered. These 'ghost genes ...

Birds are vanishing at an alarming rate. Since the Late Pleistocene, thousands of species have disappeared forever. Estimates suggest between 1,300 and 1,500 bird species are extinct.

One of North America’s most endangered species is getting a new lease on life thanks to technological innovations. This past ...

The Trump administration wants to make economic impacts a factor in what was previously a science-based decision on what's ...