How do water shrews find prey underwater?

Amphibious water shrews rely almost entirely on their sense of touch to locate prey while submerged. Because their eyes are small—or in some species, entirely covered by skin—and their ears are hidden within their fur, they do not hunt using sight or hearing.123

Instead, these mammals possess a relatively large brain with enlarged nerves connected to their abundant and highly sensitive whiskers. These whiskers allow them to detect and locate prey underwater through tactile feedback. While some shrews are known to produce various sounds, there is only meager evidence to suggest that they use echolocation, and their primary method for aquatic foraging remains the use of their sensitive facial vibrissae.142