Paleontologists in New Zealand have announced the discovery of a nearly complete skeleton of a previously unknown reptile species, Varanus arcticus, which lived during the Early Cretaceous. This 'Feathered Polar Monitor' was a medium-sized predator that inhabited the sub-polar forests of Gondwana. Uniquely, the fossil shows impressions of thick, insulating proto-feathers, the first time such structures have been found on a non-dinosaurian lepidosaur.
The findings suggest that feathers or hair-like integument were far more widespread among Cretaceous land vertebrates as an adaptation to the long, dark winters of high latitudes. The creature had specialized, forward-facing eyes and a powerful tail, indicating it was a highly mobile hunter that remained active during the freezing polar nights, rewriting our understanding of thermoregulation in ancient reptiles.