Animal Diversity Web U of M Museum of Zoology ADW Home ADW Home ADW Home University of Michigan Help About Aninal Names Teaching Special Topics About Us




Structured Inquiry Search — preview

Home -> Kingdom Animalia -> Phylum Chordata -> Subphylum Vertebrata -> Class Mammalia -> Order Perissodactyla -> Family Equidae -> Species Equus hemionus

Equus hemionus
kulan



2008/10/05 04:05:26.359 GMT-4

By Bradley Reuter

Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Mammalia
Order: Perissodactyla
Family: Equidae
Genus: Equus
Species: Equus hemionus
Members of this Species

Geographic Range

In the late Pleistocene, Equus hemionus flourished as far east as West Germany. Currently, at least one subspecies has been found in Russia, China, Iran, and India. However, the major population (over half the total number) of E. hemionus is found in southern Mongolia. (Feh et al, 2001)

Biogeographic Regions:
palearctic (native ); oriental (native ).

Habitat

E. hemionus prefers flat country. It primarily grazes and rests on highland or lowland desert, semidesert or steppe. They are never found more than 30 km from a permanent oasis or spring. (Glenn, 1999)

These animals are found in the following types of habitat:
temperate .

Terrestrial Biomes:
desert or dune .

Physical Description

Mass
200 to 260 kg; avg. 230 kg
(440 to 572 lbs; avg. 506 lbs)


Length
1.98 to 2.44 m; avg. 2.21 m
(6.49 to 8 ft; avg. 7.25 ft)


The color of the Asian wild ass varies depending on distribution and season. As a rule, they are reddish brown in the summer and lighten to yellowish brown in the winter. The underneath part of the animals is white or buff. These asses are characterized by a thick black stripe with white edges that runs down the middle of their backs. They also have small feet and short legs. Individuals may be 1-1.4 m tall at the shoulders. (Glenn, 1999)

Some key physical features:
endothermic ; bilateral symmetry .

Reproduction

Breeding season
April to October

Number of offspring
1 (high)

Gestation period
11.50 months (average)

Time to weaning
18 months (average)

Age at sexual or reproductive maturity (female)
3.50 years (average)

Age at sexual or reproductive maturity (male)
3.50 years (average)

Equus hemionus are monogamous. Stallions tend to stay with the mare and foal year-round. (Feh et al, 2001)

Mating systems:
monogamous .

Less than half of the foals born survive through the first year. (Feh et al, 2001)

Key reproductive features:
seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization (internal ); viviparous .

Other than predator defense by the male, the mare mostly raises the foal. (Feh et al, 2001)

Parental investment:
male parental care ; female parental care .

Lifespan/Longevity

Extreme lifespan (wild)
14 years (high)

Extreme lifespan (captivity)
26 years (high)

Average lifespan (wild)
6 years

Typical lifespan (wild)


Average lifespan (captivity)
26.20 years
[External Source: AnAge]


In captivity, Asian wild asses have lived for 26 years. The oldest found specimen in the wild was 12-14 years old. Most E. hemionus live between four and eight years. A majority of these die between four and six years old, not long after entering sexual maturity. (Feh et al, 2001)

Behavior

E. hemionus has been clocked at speeds of up to 43 mph. (Glenn, 1999)

Key behaviors:
motile ; territorial ; social .

Food Habits

The Asian wild ass is strictly herbivorous. They tend to eat perennial grasses (noncotyledons) that are of species of Stipa or Agropyron. They also eat herbs and bark. (Glenn, 1999)

Primary Diet:
herbivore (folivore ).

Plant Foods:
leaves; wood, bark, or stems.

Predation

Known predators

E. hemionus has a well-developed strategy for anti-predator defense. Stallions from more than one family group cooperate to chase off predators. The frequent occurrence of large groups aids this ability. Wolves are the only known predator of the Asian wild ass other than humans. (Feh et al, 2001)

Economic Importance for Humans: Negative

The protected status of the Asian wild ass has been challenged recently by nomadic herders and other farmers in Mongolia. They believe populations in southern Mongolia are becoming too large. The Asian wild ass competes with domestic grazers for water and food resources. (Reading et al., 2001)

Ways that these animals might be a problem for humans:
crop pest.

Economic Importance for Humans: Positive

During the first half of the 1900s, Asian wild asses were hunted for meat and for their coats. (Glenn, 1999)

Ways that people benefit from these animals:
food .

Conservation Status

IUCN Red List: [link]:
Vulnerable.

US Federal List: [link]:
Endangered.

CITES: [link]:
Appendix I.

The Syrian wild ass (E. hemionus hemippus) went extinct in 1927. The subspecies found in southern Mongolia (E. hemionus hemionus) contains several thousand individuals. All of the other subspecies exist in the hundreds. Conservation status varies from subspecies to subspecies. (Reading et al, 2001)

The largest threat to all of the six subspecies is competition with livestock. The species is desired by nomadic livestock herders for harvesting.

Other Comments

Substantial competition occurs between wild asses and domestic herds. The habitat of E. hemionus is often restricted from the optimal to the most arid parts of an area by this competition. (Glenn, 1999)

Contributors

Bradley Reuter (author), University of Michigan.
Bret Weinstein (editor), University of Michigan.

References

Feh, C., S. Munkhtuya, S. Enkhbold, T. Sukhbaatar. September 2001. Ecology and social structure of the Gobi khulan, Equus hemionus, subsp. in the Gobi B National Park, Mongolia. Biological Conservation, 101 (1): 51-61.

Glenn, C. 7/99. "Earth's Endangered Creatures" (On-line). Accessed October 17, 2001 at http://www.geocities.com/endangeredsp2/MEastM6.html.

Reading, R., H. Mix, B. Lhagvasuren, C. Feh, D. Kane. July 2001. Status and distribution of khulan (Equus hemionus) in Mongolia. Journal of Zoology, 254 (3): 381-389.

2008/10/05 04:05:27.904 GMT-4

To cite this page: Reuter, B. 2002. "Equus hemionus" (On-line), Animal Diversity Web. Accessed October 12, 2008 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Equus_hemionus.html.

Disclaimer: The Animal Diversity Web is an educational resource written largely by and for college students. ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts. While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control.

Other formats: OWL

Home  ¦  About Us  ¦  Special Topics  ¦  Teaching  ¦  About Animal Names  ¦  Help

Structured Inquiry Search — preview