New Amazonian species has been crowned world's biggest snake. The emerald wonder of the Amazon rainforest just yielded a ...

An expanse of ancient rock in the high-altitude Torotoro National Park in Bolivia has been revealed as the largest dinosaur ...

Bears look like textbook mammals, but hidden in their evolutionary history are two dramatic departures from the standard ...

Forget polar bears. Thegiant short-faced bear (Arctodus simus) was the true heavyweight of North America’s ancient wilderness ...

Yellowstone has long been a mecca for scientists studying how predators affect everything from elk grazing to vegetation ...