Large-Mammal Extinctions (IMAGE) University of Nebraska-Lincoln Caption The extinction of mammoths, saber-toothed cats and other large mammal species disrupted ecosystem dynamics across North America, according to a new study in the journal Science. The ecological repercussions of the extinctions are likely still echoing today and could preview the effects of future extinctions, the researchers say. Credit University of Nebraska-Lincoln / Shutterstock Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.