In the case of mammals, the best-studied group of animals, the fossil record indicates that the “background” rate of extinction, the one that prevailed before humans entered the picture ...

Given the average species lifespan for mammals, the background extinction rate for this group would be approximately one species lost ... 30 percent of the world's animals and plants could be ...

We're in the midst of the Earth’s sixth mass extinction crisis. Harvard biologist E. O. Wilson estimated that 30,000 species per year (or three species per hour) are being driven to extinction.

What is unique about the current extinction rate is the speed of the loss and the unique role of one species in seeing ... conservation status of plant and animal species. The IUCN Red List ...

For the study, researchers assessed 23,496 species of freshwater animals, determining that 24 percent were threatened with extinction ... between 1970 and 2015—a rate three times faster than ...

Human activity has increased the rate of extinction by several orders of magnitude. A recent UN report says around one million species ... measures to save the animals they love.

Given the average species lifespan for mammals, the background extinction rate for this group would be approximately one species lost ... 30 percent of the world's animals and plants could be ...