Are walruses right-handed?

Walruses are ’right-flippered’, according to research published this week in BMC Ecology. The first study of walrus feeding behaviour in the wild showed that the animals preferentially use their right flipper to remove sediment from buried food. This is the first time that any aquatic animal has been shown to prefer using one flipper to the other when foraging.

Direct observations of the underwater behaviour of free-living marine mammals are rare, especially if the animals are dangerous, like the walrus. This means that our understanding of these creatures is remarkably limited.

The scuba-diving researchers from Denmark, Greenland and Sweden went to Northeast Greenland to film male Atlantic walruses while they ate. Walruses eat invertebrate animals that live on the seabed. They are particularly fond of clams. Walruses suck out the soft part of the clam, and discard the empty shells. As clams can be buried up to 40 cm deep, the walruses must remove sediment to find them.

The videos showed that the walruses had four different types of foraging behaviour. They removed sediment by beating their right flipper, beating their left flipper, or using a water-jet from their mouth. They also rooted through the sediment using their muzzle – “like pigs in the ground”.

The research team used the videos to assess how often the walruses used each foraging technique. They found that 66% of the time they used the right flipper, 4% of the time the left flipper, 29% of the time the muzzle and only 1% of the time the water-jet. When considering only flipper use, the walruses used their right flipper 89% of the time.

Right-handed people tend to have longer bones in their right arm than their left, probably because they use it more often. To see if the same was true for walruses, the researchers compared the lengths of the right and left scapula, humerus and ulna from 23 walrus skeletons. They found that walruses did indeed have longer bones in their right flipper.

Levermann et al. said: “The implications of these findings suggest that tool-use and object manipulation is not mandatory for the development of strong limb preferences or handedness”.

BMC Ecology being an online journal is a most suitable media for making the kind of data files that have been analysed in the article available for the readers. Three movie clips of feeding walruses exemplifying the foraging techniques are attached as additional files in the article. Here we attach ’Walrus using the flippers and muzzle for exposing bivalves’.

This press release is based on the following article:

Feeding behaviour of free-ranging walruses with notes on apparent dextrality of flipper use
Nette Levermann, Anders Galatius, Goran Ehlme, Soren Rysgaard, Erik W Born
BMC Ecology 2003 3:9
http://www.biomedcentral.com/1472-6785/3/9/
Published 23 October 2003

For further information about this research please contact Nette Levermann by email at nlevermann@zi.ku.dk or by phone on +45 35321341, or Fax on +45 35321250

Media Contact

Gemma Bradley BioMed Central

Alle Nachrichten aus der Kategorie: Life Sciences

Articles and reports from the Life Sciences area deal with applied and basic research into modern biology, chemistry and human medicine.

Valuable information can be found on a range of life sciences fields including bacteriology, biochemistry, bionics, bioinformatics, biophysics, biotechnology, genetics, geobotany, human biology, marine biology, microbiology, molecular biology, cellular biology, zoology, bioinorganic chemistry, microchemistry and environmental chemistry.

Zurück zur Startseite

Kommentare (0)

Schreib Kommentar

Neueste Beiträge

Argonne targets lithium-rich materials as key to more sustainable cost-effective batteries

Next-generation batteries using lithium-rich materials could be more sustainable and cost-effective, according to a team of researchers with the U.S. Department of Energy’s (DOE) Argonne National Laboratory. The pivotal discovery,…

Why disordered light-harvesting systems produce ordered outcomes

Scientists typically prefer to work with ordered systems. However, a diverse team of physicists and biophysicists from the University of Groningen found that individual light-harvesting nanotubes with disordered molecular structures…

RadarGlass – from vehicle headlight to radar transceiver

As a result of modern Advanced Driver Assistance Systems, the use of radar technology has become indispensable for the automotive sector. With the installation of a large and growing number…

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close