It's official: the rare and elusive "eastern puma" has been removed from the list of North American wildlife protected under the Endangered Species Act. Traditionally, this would imply a recent loss or success for conservationists, but not so with this top cat. In fact, officials have revealed that the cougar in question may have been extinct for decades.
They weren't exactly there when it happened, so scientists were excited when they uncovered the birthing mystery of mighty mosasaurs, gigantic marine lizards that once roamed the ancient oceans.
Scientists may be able to bring back the long extinct woolly mammoth after pasting its DNA into the elephant's genetic code.
Even a population of a mere 2,500 people living in New Zealand managed to kill off moa, a now-extinct flightless bird, according to a recent study.