Hyenas’ ability to count helps them decide to fight or flee

When animals fight, the larger group tends to win. In the current issue of Animal Behaviour, Sarah Benson-Amram, an MSU graduate student studying zoology, showed that hyenas listen to the sound of intruders’ voices to determine who has the advantage.

“They’re more cautious when they’re outnumbered and take more risks when they have the numerical advantage,” said Benson-Amram, who conducted the study through MSU’s BEACON Center for the Study of Evolution in Action. “Hyenas appear to be as capable as chimpanzees or lions at assessing their advantage.”

The finding supports the concept that living in complex social groups, as hyenas, lions and chimpanzees do, is one of the keys to the evolution of big brains, Benson-Amram added.

Even though spotted hyenas live in clans of up to 90 individuals, they spend much of the day in much smaller, more vulnerable groups. When researchers played recordings of potential intruders, the hyenas’ reaction depended on how many voices they heard compared to how many fellow pack members surrounded them. Groups of three or more hyenas were far more likely to approach the source of sound than pairs or individuals.

This study was the first to show that hyenas can tell the difference between individual voices, and most of the animals in the study could distinguish up to three different voices, said Kay Holekamp, MSU zoologist and BEACON researcher, whose field study of spotted hyenas in Kenya has been ongoing for more than 20 years.

“The recordings were taken from hyenas from other parts of Africa,” she said. “But even though the voices were unfamiliar, the hyenas in the study were able to tell when they were from the same or different animals.”

MSU students Virginia Heinen and Sean Dryer also contributed to the study.

BEACON is an NSF-funded Science and Technology Center headquartered at MSU, with partners at North Carolina A&T State University, the University of Idaho, the University of Texas and the University of Washington.

Michigan State University has been working to advance the common good in uncommon ways for more than 150 years. One of the top research universities in the world, MSU focuses its vast resources on creating solutions to some of the world’s most pressing challenges, while providing life-changing opportunities to a diverse and inclusive academic community through more than 200 programs of study in 17 degree-granting colleges.

Media Contact

Layne Cameron EurekAlert!

More Information:

http://www.msu.edu

All latest news from the category: Life Sciences and Chemistry

Articles and reports from the Life Sciences and chemistry 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.

Back to home

Comments (0)

Write a comment

Newest articles

Lighting up the future

New multidisciplinary research from the University of St Andrews could lead to more efficient televisions, computer screens and lighting. Researchers at the Organic Semiconductor Centre in the School of Physics and…

Researchers crack sugarcane’s complex genetic code

Sweet success: Scientists created a highly accurate reference genome for one of the most important modern crops and found a rare example of how genes confer disease resistance in plants….

Evolution of the most powerful ocean current on Earth

The Antarctic Circumpolar Current plays an important part in global overturning circulation, the exchange of heat and CO2 between the ocean and atmosphere, and the stability of Antarctica’s ice sheets….

Partners & Sponsors