Ancient Arctic Discovery: Fossil of Tiny 'Ice Mouse' Unearthed in Alaska

Paleontologists have discovered a tiny fossil mammal, named Sikuomys mikros, that lived in northern Alaska around 73 million years ago. Despite the extreme cold and darkness of the Arctic winter, this small creature, resembling a shrew, stayed active year-round, burrowing underground and feeding on insects and worms. The fossil was found in sediments along the Colville River, providing insights into an ancient Arctic ecosystem that was home to dinosaurs, small mammals, and birds adapted to survive in highly seasonal and freezing conditions. The discovery sheds light on the physiology and behavior of animals in the face of drastic climatic fluctuations.