Give Now

A Moment of Science

Why Shrews Twitter

Why do the nearly blind, small, mouse-like animals make so much noise? The scientific discovery about shrews.

Small mouse‑like mammals, shrews are not actually rodents or even closely related. Shrews are noisy little creatures– constantly twittering and squeaking as they scramble through their habitat.

But why? All that noise could surely attract the attention of predators, so there must be an important reason for their endless twittering.

Communication Or Location?

One possibility is that shrews use calls for communicating with neighbors or mates. But some researchers have hypothesized that the twittering serves a totally different function– echolocation.

Since shrews have poor eyesight, listening to the way their calls echo back from the surroundings might help them navigate through their environment.

A team of German biologists reasoned that if calls were used solely for communication, then calling behavior should change depending on the presence or absence of other shrews.  But if calls were used for echolocation, calling should change in response to changes in the physical surroundings rather than social situations.

The researchers discovered that the twittering of shrews did not change in response to the simulated presence or absence of other shrews. But when the researchers changed the thickness of the straw bedding in the shrews’ enclosures, the rate of twittering changed too.

Land Animal Ecolocation

This suggests that shrews may use their calls as a simple type of echolocation, and not only for communication. The echoes from their calls help them navigate in the dark and avoid obstacles in their path.

Although more research is needed to understand how shrews use their twitter calls in the wild, the discovery is exciting news since shrews are one of the first land animals that might use echolocation.

Stay Connected

What is RSS? RSS makes it possible to subscribe to a website's updates instead of visiting it by delivering new posts to your RSS reader automatically. Choose to receive some or all of the updates from A Moment of Science:

Support for Indiana Public Media Comes From

About A Moment of Science

Search A Moment of Science