Featured Research

from universities, journals, and other organizations

Identifying Hyenas By Their Giggle

Date:
April 28, 2009
Source:
American Institute of Physics
Summary:
To human ears, the laughs of individual hyenas in a pack all sound the same: high-pitched and staccato, eerie and maniacal. But every hyena makes a different call that encodes information about its age and status in the pack, according to behavioral neurologists. They have developed a way to identify a hyena by picking out specific features of its giggle.

Two hyenas in Amboseli Kenya.
Credit: iStockphoto/Stefanie Van Der Vinden

To human ears, the laughs of individual hyenas in a pack all sound the same: high-pitched and staccato, eerie and maniacal. But every hyena makes a different call that encodes information about its age and status in the pack, according to behavioral neurologists from the University of California, Berkeley and the Université de Saint-Etienne, France. They have developed a way to identify a hyena by picking out specific features of its giggle.

The hyena does not laugh when it is having a good time. Rather, field biologists have noticed that hyenas make the sound when competing for food. The giggle is a sign of frustration, a call made by a subordinate animal when dominated by one of its peers.

To find meaning in the giggle, Nicolas Mathevon and his colleagues analyzed sounds made by 17 spotted hyenas kept in captivity. They developed an algorithm that can successfully identity an individual in the pack about half the time, by looking at the timbre and quality of a single note in its giggle. "It's like telling singers apart by having them sing one note and listening to the quality of that note," says Mathevon.

Their analysis also shows that the pitch of the giggle drops for older animals, and the giggles of animals that tend to be dominant are less variable. The next step will be to play different kinds of giggles to hyenas and test how the animals respond.

The talk "The hyena's laugh as a multi-informative signal" (4pAB3) by Nicolas Mathevon will be presented at the 157th  Acoustical Society of America Meeting to be held May 18-22 in Portland, Ore.


Story Source:

The above story is based on materials provided by American Institute of Physics. Note: Materials may be edited for content and length.


Cite This Page:

American Institute of Physics. "Identifying Hyenas By Their Giggle." ScienceDaily. ScienceDaily, 28 April 2009. <www.sciencedaily.com/releases/2009/04/090426094329.htm>.
American Institute of Physics. (2009, April 28). Identifying Hyenas By Their Giggle. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2009/04/090426094329.htm
American Institute of Physics. "Identifying Hyenas By Their Giggle." ScienceDaily. www.sciencedaily.com/releases/2009/04/090426094329.htm (accessed July 31, 2014).

Share This




More Matter & Energy News

Thursday, July 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Britain Testing Driverless Cars on Roadways

Britain Testing Driverless Cars on Roadways

AP (July 30, 2014) — British officials said on Wednesday that driverless cars will be tested on roads in as many as three cities in a trial program set to begin in January. Officials said the tests will last up to three years. (July 30) Video provided by AP
Powered by NewsLook.com
Amid Drought, UCLA Sees Only Water

Amid Drought, UCLA Sees Only Water

AP (July 30, 2014) — A ruptured 93-year-old water main left the UCLA campus awash in 8 million gallons of water in the middle of California's worst drought in decades. (July 30) Video provided by AP
Powered by NewsLook.com
Smartphone Powered Paper Plane Debuts at Airshow

Smartphone Powered Paper Plane Debuts at Airshow

AP (July 30, 2014) — Smartphone powered paper airplane that was popular on crowdfunding website KickStarter makes its debut at Wisconsin airshow (July 30) Video provided by AP
Powered by NewsLook.com
U.K. To Allow Driverless Cars On Public Roads

U.K. To Allow Driverless Cars On Public Roads

Newsy (July 30, 2014) — Driverless cars could soon become a staple on U.K. city streets, as they're set to be introduced to a few cities in 2015. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



      Save/Print:
      Share:  

      Free Subscriptions


      Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

      Get Social & Mobile


      Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

      Have Feedback?


      Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
      Mobile iPhone Android Web
      Follow Facebook Twitter Google+
      Subscribe RSS Feeds Email Newsletters
      Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins