Mammals, birds and amphibians are currently becoming extinct at rates comparable to the previous five mass extinctions.
Global warming is still a fear that will cause mass extinction as a study shows that it destroyed the world 252 million years ago.
Dinosaur extinction was caused by an asteroid impact 66 million years ago that also triggered a series of volcanic eruptions, say researchers from the University of California Berkeley.
No, it isn't the End of Days, but we are likely living during what experts will later refer to as one of the largest extinction events in Earth's history - an unexpected addition to prehistory's "Big Five" mass extinctions.
Sixty-six million years ago, a massive asteroid struck Mexico's Yucatán Peninsula. As a result, the Earth changed forever, spelling the end of the dinosaurs and ushering in a new age where other animals could flourish. Now new research has revealed that it wasn't mammals who inherited the Earth, but fish.
As far as scientists know, there have been a grand total of five mass extinctions over the last 500-million years - world-changing events during which the great majority of Earth's life was eliminated to make way for new organisms and evolutionary paths. However, for several decades, some experts have suspected that a 6th mass extinction existed among these "Big Five." Now researchers are claiming to have found extremely compelling proof of its existence.
About 65 million years ago, an asteroid crash supposedly wiped out all the dinosaurs on Earth. Now, scientists may soon finally solve the mystery behind this dino-killing crash.
It's no secret that ocean acidification caused by climate change is currently wreaking havoc on our oceans, but a new study shows that acidic oceans also triggered the greatest mass extinction ever on Earth.
It turns out that toxic oceans are to blame, at least in part, for an ancient mass extinction event that occurred over 200 million years ago, new research says.