Large, violent animal packs shaped the ecosystems of the Pleistocene epoch

http://www.sciencedaily.com/releases/2015/10/151026171412.htm

Intense, violent attacks by large packs of some of the world’s biggest carnivores — including extinct lions much larger than those of today, and sabertooth cats — limited the population sizes of mammoths, mastodons and other species, and prevented widespread habitat destruction in the Pleistocene Epoch.

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