Why do shrews have long mobile snouts?

Shrews have long, mobile snouts that serve as essential tools for their survival, primarily by aiding in their constant, frenetic search for food. These snouts are covered with long, sensitive whiskers that allow the animals to detect invertebrates in soil and leaf litter.12

Beyond sensory detection, the flexible muzzle is used to manipulate prey; as a shrew chews, it uses its snout to push food sideways. Additionally, some burrowing species, such as the short-tailed shrew, utilize their muzzles to help push loose soil out of their tunnel systems. This combination of tactile sensitivity and physical utility makes the mobile snout a vital adaptation for the shrew's high-metabolism lifestyle.132