Extinction of woolly mammoth, saber-toothed cat may have been caused by human predators

ScienceDaily (2010-07-01) -- A new analysis of the extinction of woolly mammoths and other large mammals more than 10,000 years ago suggests that they may have fallen victim to the same type of "trophic cascade" of ecosystem disruption that scientists say is being caused today by the global decline of predators such as wolves, cougars and sharks.