News Summary

• Miracinonyx trumani lived as a generalist predator in temperate grasslands.
• In the Arctic Yukon, however, the cats occupied a very different ecological role as tertiary consumers.
• Genomes revealed genetic features that may have helped northern populations cope with the harsh conditions of the Late Pleistocene.
• Results also offer new clues about why M.trumani eventually disappeared near the end of the Pleistolithic.
• The results also show evidence of low diversity in animals from both Wyoming and the Yukon.