White-sided jackrabbit (Lepus callotis)

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White-sided jackrabbit fact file

White-sided jackrabbit description

KingdomAnimalia
PhylumChordata
ClassMammalia
OrderLagomorpha
FamilyLeporidae
GenusLepus (1)

A large hare of North America, the white-sided jackrabbit (Lepus callotis) has a short, coarse coat of light grey fur, with large, conspicuous white patches along the flanks (3). It is similar in appearance to the black-tail jackrabbit (Lepus californicus), but may be distinguished from this species by its stockier build, more grizzled fur and large, white-tipped ears (4)

The white-sided jackrabbit also has a black tail, with white on the underside, and a cream-buff head, mixed with black, with a whitish area on the side, around the eyes. The inner surfaces of the limbs are white and the outer surfaces are stained with buff, while the rump is separated by a black line that is largely concealed by sooty, brownish and white-tipped hairs (3)

The white-sided jackrabbit has large ears and long limbs, which appear almost disproportionate to its body size, that together increase its body surface area to help dissipate heat (4). The female white-sided jackrabbit tends to be larger than the male (3) (5)

There are currently two recognised subspecies of the white-sided jackrabbit: Lepus callotis gaillardia and Lepus callotis callotis (1). Lepus callotis callotis primarily differs from Lepus callotis gaillardia by a blackish hue to the fur, rather than a pale hue, and a black rather than brown nape (3).

Also known as
Gaillard’s jackrabbit.
Spanish
Liebre Torda.
Size
Male length: 52.5 - 53.2 cm (2)
Female length: 54.1 - 57.5 cm (2)
Male weight: 1.5 - 2.2 kg (2)
Female weight: 2.5 - 3.2 kg (2)
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White-sided jackrabbit biology

A strictly nocturnal species, during the day the white-sided jackrabbit shelters in depressions in the ground known as ‘forms’, which are usually constructed in clumps of grass (4). It rarely occupies underground shelters (5). Over 90 percent of the white-sided jackrabbit’s diet consists of grasses and sedges (2), such as tabosa, buffalo grass, and blue grama (4)

When startled by a predator, such as an eagle, hawk, owl, fox or coyote, the white-sided jackrabbit leaps straight upwards, while extending the hind legs and flashing its white parts. To escape, it makes rather long, high leaps, alternately flashing its white sides as it runs away. The long hind legs are highly adapted for speed, giving the white-sided jackrabbit lift, and enabling it to escape in a zigzag fashion that surpasses its predators (5)

A monogamous species that mates for life, the white-sided jackrabbit is often seen in male-female pairs, with the male defending the pair from other males. The breeding season, which lasts for a minimum 18 weeks (3), varies from the middle of April to August (1). Usually two young are born each season, but during periods of favourable weather, the white-sided jackrabbit may attempt to rear up to three litters in a year (1). The young are born with a soft woolly coat, and attain sexual maturity at a rapid rate, breeding at just over a year old (5).

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White-sided jackrabbit range

The white-sided jackrabbit is only found in North America, where it is distributed from south-western New Mexico in the U.S. to northern Oaxaca in Mexico. In the U.S., it is found at just two locations in Hidalgo County, with a total range of just 120 square kilometres (1) (3)

Lepus callotis gaillardi has a rather discontinuous distribution that extends from south-western New Mexico to north-central Mexico, while Lepus callotis callotis is distributed from the central part of east Durango toward the plains of the central part of Mexico (1).

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White-sided jackrabbit habitat

The white-sided jackrabbit inhabits open grasslands on high-altitude, level plains. It typically avoids hill areas with trees and shrubs, preferring level lands full of grasses. In Queretaro, Mexico, the white-sided jackrabbit is found on cultivated lands, while in western Sonora, Mexico, it occurs on true desert, where it frequents bushy watercourses (1) (6).

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White-sided jackrabbit status

The white-sided jackrabbit is classified as Near Threatened (NT) on the IUCN Red List (1).

IUCN Red List species status – Near Threatened

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White-sided jackrabbit threats

In the U.S., the white-sided jackrabbit has suffered a substantial population decline. In part, this is the result of habitat loss from overgrazing by livestock and the suppression of natural wildfires (1), which would normally prevent bushes establishing in this species’ largely barren habitat (7). Between 1976 and 1981, the white-sided jackrabbit population in New Mexico and neighbouring Durango, Mexico declined by 50 percent, with the total population then estimated at just 340 individuals. Surveys of this population between 1990 and 1995 counted less than five white-sided jackrabbits per year (1) (8)

The decline of the white-sided jackrabbit in both the U.S. and Mexico has been accompanied by the expansion of the black-tail jackrabbit, which has adapted well to habitat change and can outcompete the white-sided jackrabbit, causing further declines (1)

Additional threats to the white-sided jackrabbit include hunting for sport and local subsistence, human disturbance and predation by introduced animals (1). There are probably more jackrabbits killed for food in Mexico than any other game mammal (6). Global climate change has been identified as a further threat to this species, as the frequency of drought is expected to increase (1), leading to bushes and other unfavourable vegetation encroaching upon this species’ habitat (8). Up to 60 percent of the white-sided jackrabbit’s habitat is expected to be lost by 2050 due to climate change, with northern parts of its range being most severely affected (1).

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White-sided jackrabbit conservation

In 1975, the rapid demise of the white-sided jackrabbit was recognised by its listing as Threatened by the New Mexico Department of Game and Fish. As a result, this species became the focus of increased conservation efforts, including measures to monitor its population status and trends, as well as measures to encourage shrub control and prevent detrimental grazing practices by local landowners (1)

Further recommended conservation priorities for the white-sided jackrabbit include research to determine population numbers and range, as well as further monitoring efforts to establish trends (1).

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Find out more

Find out more about conservation in the U.S:

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Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
arkive@wildscreen.org.uk

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Glossary

Monogamous
Having only one mate during a breeding season, or throughout the breeding life of a pair.
Nocturnal
Active at night.
Subspecies
A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.
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References

  1. IUCN Red List (April, 2011)
    http://www.iucnredlist.org/
  2. Smithsonian National Museum of Natural History: North American Mammals - White-sided jackrabbit (April, 2011)
    http://www.mnh.si.edu/mna/image_info.cfm?species_id=138
  3. Best, T.L. and Henry, T.H. (1993) Lepus callotis. Mammalian Species, 442: 1-6.
  4. New Mexico Game and Fish: Wildlife Notes - White-sided jackrabbit (April, 2011)
    http://www.wildlife.state.nm.us/education/wildlife_notes/documents/white-sidedjackrabbit.pdf
  5. MobileReference (2008) Encyclopedia of North American Mammals. MobileReference, Boston.
  6. Leopold, A.S. (1959) Wildlife of Mexico: the Game Birds and Mammals. University of California Press, California.
  7. Montoya Brian, S. (2009) Multiplying Like Bunnies? Not This Jackrabbit. Huffington Post. 
  8. WildEarth Guardians - White-sided jackrabbit (April, 2011)
    http://www.wildearthguardians.org/support_docs/factsheet_jackrabbit_FINAL.pdf
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Image credit

White-sided jackrabbit in habitat  
White-sided jackrabbit in habitat

© John Hays

John Hays
http://www.flickr.com/photos/32422548@N00/

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