Extinct

These declines in relative and absolute shark abundance suggest that something happened to shark populations about 19 million years ago, Dr. Sibert concluded.But there was still the question of whether a true extinction occurred, she said.…

The Tasmanian tiger is still extinct. Reports of its sustained survival are greatly exaggerated.Officially known in science as thylacines, the large marsupial predators, which looked more like wild dogs than tigers and stretched across…

NASA safely landed a new robotic rover on Mars Thursday and began its most ambitious endeavor in decades to directly investigate whether there ever was life on the now barren red planet.While the agency has completed other missions to Mars,…