Shrews may grow bigger snouts in winter to cope with cold air, scientists say

Scientists have observed a unique winter adaptation in long-clawed shrews, where their snouts elongate despite an overall decrease in skull size. This phenomenon, studied in shrew skulls from Japan, builds on the previously identified 'Dehnel's phenomenon' where some small mammals reversibly shrink body, skull, and brain mass during winter to cope with cold. The elongation of snouts in shrews is a newly discovered aspect of this adaptation, potentially aiding in dealing with cold air. This research highlights the diverse strategies mammals employ to survive harsh environmental conditions and adds to our understanding of reversible physiological changes.