Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Success by Learning - Smallest Predator Recognizes Prey by its Shape

The Etruscan shrew (Suncus etruscus) is one of the world's smallest mammals. It is about four centimetres long and weighs merely two grams.

Being a nocturnal animal, it hunts predominantly with its sense of touch. Professor Michael Brecht (Bernstein Center for Computional Neuroscience, Berlin) now reported on the particularities of its hunting behaviour at the international conference "Development and function of somatosensation and pain" at the Max Delbrück Center for Molecular Medicine (MDC) Berlin-Buch, Germany.

"As quick as a flash, the Etruscan shrew scans its prey and adapts, when necessary, its hunting strategy," explained Brecht in his talk. "Thus, no prey escapes."

The smaller an animal is, the greater is its loss of warmth over its surface. To avoid starvation, the Etruscan shrew has to constantly compensate for this life-threatening energy loss. Thus, it consumes twice its weight every day and feeds on crickets, cockroaches, and spiders. Since the prey are nearly as big as their predator, the shrew has to attack fast and well directed.

... more about:
»Etruscan »attack »prey »shrew

Etruscan shrews hunt in the night and must rely on their sense of touch. With long whiskers at the snout, they can locate potential prey and recognize whom exactly they are facing. Afterwards, the shrews kill their prey using directed attacks. The researchers could observe that they track down crickets with a forceful bite in the back. To investigate whether the animals recognize their prey by its shape, they offered the Etruscan shrews a plastic cricket. Though the artificial animal neither moved nor smelled, the Etruscan shrews attacked the plastic prey up to 15 times. "The Etruscan shrews trust in their sense of touch and the tactile shape recognition in an extent we do not know from other animal species," reported Brecht at the MDC conference.

"Also, the animals can adjust quickly to new situations", Brecht pointed out. To examine this theory, the scientists exchanged the living crickets with a giant cockroach. This new animal differs clearly from the natural prey of the shrews. The back of the cockroach is protected by a heavy shield and is therefore saved from the normal attacks of the Etruscan shrews. However, the experiments showed that the shrews succeeded in adapting their natural hunting strategy to the new prey in very short time. Quickly, they realized that the belly is the cockroach's weak point. "The shrews are learning during the hunt and use the new knowledge right away," said Brecht. "Even the giant cockroach can not escape."

Barbara Bachtler
Press and Public Affairs
Max Delbrück Center for Molecular Medicine (MDC) Berlin-Buch
Robert-Rössle-Straße 10; 13125 Berlin; Germany
Phone: +49 (0) 30 94 06 - 38 96
Fax: +49 (0) 30 94 06 - 38 33

Barbara Bachtler | Max-Delbrück-Centrum
Further information:

Further reports about: Etruscan attack prey shrew

More articles from Life Sciences:

nachricht Biologists unravel another mystery of what makes DNA go 'loopy'
16.03.2018 | Emory Health Sciences

nachricht Scientists map the portal to the cell's nucleus
16.03.2018 | Rockefeller University

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Locomotion control with photopigments

Researchers from Göttingen University discover additional function of opsins

Animal photoreceptors capture light with photopigments. Researchers from the University of Göttingen have now discovered that these photopigments fulfill an...

Im Focus: Surveying the Arctic: Tracking down carbon particles

Researchers embark on aerial campaign over Northeast Greenland

On 15 March, the AWI research aeroplane Polar 5 will depart for Greenland. Concentrating on the furthest northeast region of the island, an international team...

Im Focus: Unique Insights into the Antarctic Ice Shelf System

Data collected on ocean-ice interactions in the little-researched regions of the far south

The world’s second-largest ice shelf was the destination for a Polarstern expedition that ended in Punta Arenas, Chile on 14th March 2018. Oceanographers from...

Im Focus: ILA 2018: Laser alternative to hexavalent chromium coating

At the 2018 ILA Berlin Air Show from April 25–29, the Fraunhofer Institute for Laser Technology ILT is showcasing extreme high-speed Laser Material Deposition (EHLA): A video documents how for metal components that are highly loaded, EHLA has already proved itself as an alternative to hard chrome plating, which is now allowed only under special conditions.

When the EU restricted the use of hexavalent chromium compounds to special applications requiring authorization, the move prompted a rethink in the surface...

Im Focus: Radar for navigation support from autonomous flying drones

At the ILA Berlin, hall 4, booth 202, Fraunhofer FHR will present two radar sensors for navigation support of drones. The sensors are valuable components in the implementation of autonomous flying drones: they function as obstacle detectors to prevent collisions. Radar sensors also operate reliably in restricted visibility, e.g. in foggy or dusty conditions. Due to their ability to measure distances with high precision, the radar sensors can also be used as altimeters when other sources of information such as barometers or GPS are not available or cannot operate optimally.

Drones play an increasingly important role in the area of logistics and services. Well-known logistic companies place great hope in these compact, aerial...

All Focus news of the innovation-report >>>



Industry & Economy
Event News

Ultrafast Wireless and Chip Design at the DATE Conference in Dresden

16.03.2018 | Event News

International Tinnitus Conference of the Tinnitus Research Initiative in Regensburg

13.03.2018 | Event News

International Virtual Reality Conference “IEEE VR 2018” comes to Reutlingen, Germany

08.03.2018 | Event News

Latest News

Wandering greenhouse gas

16.03.2018 | Earth Sciences

'Frequency combs' ID chemicals within the mid-infrared spectral region

16.03.2018 | Physics and Astronomy

Biologists unravel another mystery of what makes DNA go 'loopy'

16.03.2018 | Life Sciences

Science & Research
Overview of more VideoLinks >>>