The vast frozen terrain of Arctic permafrost thawed several times in North America within the past 1 million years when the world's climate was not much warmer than today, researchers from the United ...

During the Pleistocene Epoch, North America was home to a diverse array of megafauna—large animals that dominated the continent’s landscapes. These creatures, some of which are now extinct, played ...

Researchers identified the fossil as Glyptodon reticulatus, a megafauna species from the Late Pleistocene epoch.