Dinosaurs are the biggest creatures to ever walk the Earth, but even among giants, there is one dinosaur that stood taller ...

The largest animal on Earth today is the blue whale which can reach 98 feet long – enormous (and the largest recorded blue ...

Megafauna were large animals, some of which remain today, including elephants, moose and whales. There were several megafauna species that went extinct fairly recently in geological time during ...

Humans were 'the key driver,' researchers said, behind these species' extinction. Scientists refer to large animals — defined as anything greater than 99 pounds (45 kilograms ...

When Alberto Collareta first laid eyes on the boulder-sized vertebrae of the extinct animal, he couldn’t believe what he was seeing. He wondered how a creature that large could even move around.

Large fish, in which he specializes, are especially at risk: Most of the biggest freshwater animals are threatened with extinction, he says. “This is the first of these very large freshwater ...

WASHINGTON — Nearly a quarter of animals living in rivers, lakes and other freshwater sources are threatened with extinction, according to new research published Wednesday. “Huge rivers like ...

Fossils from La Brea Tar Pits in Southern California suggest that sabertooth cats and other large North American mammals disappeared as a result of wildfires spurred by human activity. By Katrina ...

In the case of the thylacine, the first step is sequencing the extinct animal's DNA – the genetic ... frozen in Arctic tundra mean that this large mammal could return. Most woolly mammoths ...

The massive megalodon was not hunting only large marine mammals such as whales as researchers widely thought, a new study of ...

The world’s largest bee may also be the planet’s most ... and it was presumed extinct. But Wallace’s giant bee (Megachile pluto) was not gone. In 1981, an entomologist named Adam Messer ...

When a layer with a large and diverse number of animals is found, scientists can see that a mass die-off occurred. Scientists warn we have entered a sixth mass extinction. Under a normal ...