Sentences with phrase «spotted hyena»

Researchers collected more than 55,000 observations of social interactions of spotted hyenas over a 20 year period in Kenya, making this one of the largest to date of social network dynamics in any non-human species.

To their suprise, whereas rabies proved virulent to bat - eared foxes and white - tailed mongooses, for example, spotted hyenas in many cases eliminated the virus from their bodies or else apparently carried low viral loads and experienced no ill effects.

EXOTIC foreign males are most attractive — for female spotted hyenas at least.

As many as 47,000 spotted hyenas live in sub-Saharan Africa.

Similarly, studies of a variety of bird species, as well as spotted hyenas, have shown how individuals that are more eager to explore new things tend to be the most innovative ones.

It reduced the lion population by approximately 30 % and killed many spotted hyena juveniles.

So Dinets and Eligulashvili were surprised when they observed striped hyenas — the little known, mostly solitary relatives of the better - known spotted hyenas of Africa — in the middle of grey wolf packs, moving together through a maze of canyons in the southern part of the Negev desert.

Living in a complex social world — one with shifting alliances and competitors — is often cited as the key reason humans, dolphins, and spotted hyenas evolved large brains.

Chimpanzees travel together, capuchins cooperate in fights, and spotted hyenas cooperate in hunting, but the common ways that leaders promote those collective actions has remained mysterious, Smith and her colleagues say.

There are notable exceptions to this rule: leadership is inherited rather than gained through experience among spotted hyenas and the Nootka, a Native Canadian tribe on the northwest coast of North America.

Nearly 90 per cent of male spotted hyenas (Crocuta crocuta) leave their birth clan and disperse to pastures new, but until now it has never been clear what drives them away.

In the two decades following the epidemic, wild canids died following CDV infection but fatal CDV was not observed in lions or spotted hyenas anymore, even though high prevalence of serum antibodies against CDV in some years indicated outbreaks of asymptomatic exposure to the virus in lions and hyenas.

The laboratory experiments also showed that the amino acid combination in the CDV - H protein typically found in domestic dog strains (519R / 549Y) was particularly good at invading cells with domestic dog receptors but far less efficient at entering cells with non-canid receptors, effectively making domestic dog strains less able to infect lions and spotted hyenas if they are exposed to them.

First, the specific 1993/94 strain that was so lethal to lions and spotted hyenas apparently died out, as it was not found in the ecosystem after 1999.

Spotted hyena cubs of high - ranking mothers have a lower probability of infection with and are less likely to die from canine distemper virus (CDV) than cubs of low - ranking mothers.

And the arrival of the African spotted hyena into Eurasia matches the extinction of the giant short - facet hyena about 800,000 years ago.

Although genital mimicry is rare in the animal world, female spotted hyenas have sham scrotums and pseudo penises so convincing that even experts have a hard time distinguishing males from females.

In 2016, scientists published the results of a study that simulated how zebras appear to lions and spotted hyenas in different lighting conditions and from different distances.

Holekamp and Smale say that the ability of spotted hyenas to manipulate the sex ratio of their offspring makes evolutionary sense.

The spotted hyenas (Crocuta crocuta) have hierarchical societies similar to those of primates; lions (Panthera leo) live in egalitarian prides with as many as 21 members; whereas tigers (P. tigris) and leopards (P. pardus) lead more solitary lives, except when females have young or when males and females meet to mate.

According to a report in the current issue of the Proceedings of the National Academy of Sciences, the spotted hyena can carry the virus without developing symptoms.

SPOTTED hyenas can drastically alter the sex ratio of their young from one litter to the next, say two American biologists.

Spotted hyenas are considered one of the most social carnivores; they live in large competitive groups and exhibit complex social behaviors.

Spotted hyenas are high on the list of suspects as the final link in the chain because they mix with lions at a kill.

Additional findings from Monell revealed that other exclusively carnivorous mammals, including sea lions and spotted hyenas, also have lost the ability to detect sweet taste.

The spotted hyena is doing well enough to be considered of «Least Concern» by IUCN, but its population is also declining, primarily due to habitat loss.

Indeed, after the rook paper appeared, Christine Drea of Duke University in Durham, North Carolina, published a study showing that spotted hyenas can cooperate on a similar task (Animal Behaviour, DOI: 10.1016 / j.anbehav.2009.06.030).

The long - running debate about why just one of several canine distemper virus (CDV) outbreaks in the Serengeti in Tanzania during the past 25 years was fatal for lions and spotted hyenas has been resolved.

In 1993/1994, an unexpectedly fatal and widespread CDV epidemic spread through lions and spotted hyenas in the Serengeti National Park (NP) in northwestern Tanzania.

Carnivores in the Serengeti infected with CDV.Top left: bat - eared fox; Top right: African wild dog; Bottom left: spotted hyena; Bottom right: African lion.

«Rare combination of genetic changes increases the virulence of canine distemper virus: Study explains how CDV killed lions, spotted hyenas in the Serengeti.»

I joined Dr. Kay Holekamp's lab, which focuses on the ontogenetic development, physiological substrates, and evolution of mammalian behavior, using the free - living spotted hyena as a model species.

The spotted hyena (Crocuta crocuta) as a model system for study of the evolution of intelligence.

Similar protective associations have also been documented in moose in living in Yellowstone, that give birth near roads to keep predatory traffic - averse brown bears away from their offspring, and mountain nyala in Ethiopia that use human shields against their spotted hyena predators.

It's not yet clear whether symbiotic microbes led to the split between striped and spotted hyenas, but Theis said scientists now better understand the broad influence that microbes can have.

One example is the spotted hyena, which is living in Africa today, but which appeared also in Europe during the glacial period.

The spotted hyena and the striped hyena live side by side on the African savanna.

Biologists assume, for example, that the spotted hyena is now found in savannas and arid regions of Africa and the Middle East because it is perfectly adapted to their specific conditions, such as high temperatures and aridity.

Beckmann C and Ilany A. November 2013, Social structure and rank predict fitness in spotted hyenas, 5th Annual Undergraduate Research Conference at the Interface of Biology and Mathematics, University of Tennessee, Knoxville.

Spotted hyenas are affected by the structure of their social network when forming and maintaining social bonds, according to a new study in the journal Ecology Letters of the long - term dynamics of hyena social networks.

Just like a spotted hyena would be.

And indeed, we find a spotted hyena with three pups, one of which is very small and completely black, the other two are bigger, already have their spots and are very cheeky.

The Big 5 Madikwe Game Reserve, consisting of reclaimed farm land, is famous for the ambitious re-stocking program «Operation Phoenix» and is now home to the big five and is famous for its wild dog and spotted hyena.