Study finds human-driven mass extinction is eliminating entire branches of the tree of life
The passenger pigeon. The Tasmanian tiger. The Baiji, or Yangtze river dolphin. These rank among the best-known recent victims of what many scientists have declared the sixth mass extinction, as human actions are wiping out vertebrate animal species hundreds of times faster than they would otherwise disappear.
Yet, a recent analysis from Stanford University and the National Autonomous University of Mexico, published this week in the Proceedings of the National Academy of Sciences, shows the crisis may run even deeper. Each of the three species above was also the ...












