![]() Hikers may see a remembrance sign with brief details at some of the wrecks, but the full stories remain mostly tucked away in the fading folds of history. ![]() Soft, leafy plants have curled around the jagged and crumpled pieces of metal and saplings are slowly replacing the mature trees destroyed all those years ago. These sites are frozen in time, telling silent stories of violent wrecks that now, dozens of years later, are surrounded by hushed forests and relatively few human visitors. But dotted along these Rocky Mountain paths is another scene that holds a different kind of emotion: plane crashes. Ĭheck us out on EarthSnap, a free app brought to you by Eric Ralls and of Colorado's trails wind through spectacular sites - hidden waterfalls, rocky peaks, dramatic ridge lines. The study is published in the Journal of Systematic Palaeontology. In a world dominated by towering dinosaurs, the tiny ice mouse and its incredible survival story stand as a testament to nature’s adaptability and resilience. This subterranean lifestyle might have been the saving grace for such mammals, especially after the cataclysmic meteorite crash that spelled doom for the dinosaurs 66 million years ago. The survival strategy of Sikuomys mikros possibly revolved around an underground existence during Alaska’s freezing months. Being small would mean lower food and energy requirements, an invaluable advantage in such an environment. One curious aspect of the ice mouse’s existence is its small size, especially when compared to related species found further south which were significantly larger.ĭrawing parallels with today’s shrews, Eberle hypothesizes that the ice mouse’s diminutive size could have been an evolutionary response to the scarcity of food during Alaskan winters. “You look under the microscope and see this perfect little tooth. The fossils, mainly teeth and jaw fragments, required diligent scrutiny under microscopes. Their travels often involved navigating by snowmobile or bush plane from Deadhorse, Alaska. The dedicated team, which included paleontologists from institutions such as the University of Alaska Fairbanks and Florida State University, embarked on a challenging journey to the excavation site, located close to the Beaufort Sea. A polar forest bustling with dinosaurs, small mammals, and birds, all adapted to endure a highly seasonal climate,” said study co-author Patrick Druckenmiller, director of the University of Alaska Museum of the North. “Seventy-three million years ago, northern Alaska was an ecosystem unlike any on Earth today. The remains of the tiny ice mouse open up a fascinating window into ancient Alaska. You never know what you’re going to find, but you know it’s going to be new,” said Eberle. “I always like working at the ends of the Earth. The fossil’s identification was based solely on a few minuscule teeth, each no bigger than a grain of sand. This is a truly surprising and commendable feat, given the tough conditions they faced, which included months of darkness and sub-zero temperatures. “They stayed active all year long, burrowing under leaf litter or underground and feeding on whatever they could sink their teeth into, probably insects and worms.” ![]() “These guys probably didn’t hibernate,” said Eberle. This tiny fur-covered creature, with an appearance likely similar to today’s shrews, weighed only 11 grams – lighter than an empty soda can. Instead, it belonged to the extinct Gypsonictopidae family. Focus of the studyĮberle explained that the name of the tiny ice mouse – Sikuomys mikros – is derived from the Iñupiaq word “Siku” for ice, combined with the Greek words “mys” and “mikros,” which translate to “mouse” and “little” respectively.ĭespite its name, however, the small mammal was not actually a mouse. The research was led by Jaelyn Eberle, a professor at the University of Colorado Boulder and curator of fossil vertebrates at the CU Museum of Natural History. In the harsh landscapes of northern Alaska, which are marked by frigid cold and stretches of unending darkness, a remarkable discovery has been made. This region, which sat even further north roughly 73 million years ago, was home to a tiny mammal adept at surviving in possibly some of Earth’s coldest conditions during the Late Cretaceous period. ![]()
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