In the last ten years, at least 15 species have officially checked out, never to be seen again. It's ironic to think how ...

including all extant and notable species—from the lordly lion, to the ostentatious ocelot, to even extinct entries like the jaw-dropping sabertooth tiger,” Pop Chart writes in its description ...

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 ...