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Black-tailed Jack Rabbit - Lepus californicus

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Potential Species of Concern

Global Rank: G5
State Rank: SU

Agency Status
USFWS:
USFS:
BLM:
FWP Conservation Tier: 2


 

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General Description
The common name Black-tailed Jack Rabbit is derived from the prominent black coloration on the dorsal surface of the tail (the ventral side is colored white). The Black-tailed Jack Rabbit is a medium sized hare with exceptionally long ears and hind legs. The average weight of two male specimens from Montana was 2.0 kilograms; and 2.6 kilograms for four non-pregnant females (Foresman 2012b). Both males and females have a musky odor that originates from two rectal glands (Vorhies and Taylor 1933). The pelage is grayish-brown to grayish-black in coloration, and the black tail is quite distinct. Juveniles possess a darker coat that is replaced by the paler, adult pelage in six to nine months (Haskell and Reynolds 1947). An annual molt occurs in adults between late August and early October depending on latitude. The supraorbital process of the skull is pronounced, and both the rostrum and braincase are long and slender. The skull contains a total of 28 teeth and the dental formula is: I 2/1, C 0/0, P 3/2, M 3/3 (Best 1996).

Diagnostic Characteristics
The long ears and hind legs distinguish the Black-tailed Jack Rabbit from the three species of Montana cottontails (Sylvilagus floridanus, S. audubonii, and S. nuttallii), as well as the Pygmy Rabbit (Brachylagus idahoensis) (Foresman 2012b). Both the White-tailed Jack Rabbit (Lepus townsendii) and the Snowshoe Hare (Lepus americanus) lack the black coloration on the tail. Unlike these two members of the genus Lepus, Black-tailed Jack Rabbits do not change pelage color in winter.

General Distribution
Montana Range



Western Hemisphere Range

 


Summary of Observations Submitted for Montana
Number of Observations: 17

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Records associated with a range of dates are excluded from time charts)



Migration
This species is considered non-migratory. No information is available on the daily movements and home ranges within the state of Montana. In Kansas, home ranges were reported to be between 20 and 140 hectares, and less than 16 hectares in Idaho (Harestad and Burnell 1979, Lechleitner 1959, Tiemeier 1965). Dispersal distances of up to 45 kilometers in 17 weeks have been reported.

Habitat
No information is available for Montana, however, in other portions of its range the Black-tailed Jack Rabbit is known to occupy a small range of habitats, including open plains, fields, and deserts (Caire et al. 1989). In the United States it has often been reported that populations increase with heavy cattle grazing (Taylor and Lay 1944, Tiemeier 1965), and in Mexico the species occupies desert habitats and grasslands that have been grazed almost to bare ground (Leopold 1959). A single study from Colorado indicated that the species preferred light to moderate grazing (Flinders and Hansen 1795), but in all cases, Black-tailed Jack Rabbits are associated with open country with scattered shrubs or cacti for cover. The species is known to occur at elevations ranging from 84 meters below to 3,750 meters above sea level (Best 1996).

Ecological Systems Associated with this Species
  • Details on Creation and Suggested Uses and Limitations
    How Associations Were Made
    We associated the use and habitat quality (high, medium, or low) of each of the 82 ecological systems mapped in Montana for vertebrate animal species that regularly breed, overwinter, or migrate through the state by:
    1. Using personal observations and reviewing literature that summarize the breeding, overwintering, or migratory habitat requirements of each species (Dobkin 1992, Hart et al. 1998, Hutto and Young 1999, Maxell 2000, Foresman 2001, Adams 2003, and Werner et al. 2004);
    2. Evaluating structural characteristics and distribution of each ecological system relative to the species’ range and habitat requirements;
    3. Examining the observation records for each species in the state-wide point database associated with each ecological system;
    4. Calculating the percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system to get a measure of “observations versus availability of habitat”.
    Species that breed in Montana were only evaluated for breeding habitat use, species that only overwinter in Montana were only evaluated for overwintering habitat use, and species that only migrate through Montana were only evaluated for migratory habitat use.  In general, species were associated as using an ecological system if structural characteristics of used habitat documented in the literature were present in the ecological system or large numbers of point observations were associated with the ecological system.  However, species were not associated with an ecological system if there was no support in the literature for use of structural characteristics in an ecological system, even if point observations were associated with that system.  High, medium, and low habitat quality was assigned based on the degree to which the structural characteristics of an ecological system matched the preferred structural habitat characteristics for each species in the literature.  The percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system was also used to guide assignments of habitat quality.  If you have any questions or comments on species associations with ecological systems, please contact Bryce Maxell at bmaxell@mt.gov or (406) 444-3655.

    Suggested Uses and Limitations
    Species associations with ecological systems should be used to generate potential lists of species that may occupy broader landscapes for the purposes of landscape-level planning.  These potential lists of species should not be used in place of documented occurrences of species (this information can be requested at: http://mtnhp.org/requests/default.asp) or systematic surveys for species and evaluations of habitat at a local site level by trained biologists.  Users of this information should be aware that the land cover data used to generate species associations is based on imagery from the late 1990s and early 2000s and was only intended to be used at broader landscape scales.  Land cover mapping accuracy is particularly problematic when the systems occur as small patches or where the land cover types have been altered over the past decade.  Thus, particular caution should be used when using the associations in assessments of smaller areas (e.g., evaluations of public land survey sections).  Finally, although a species may be associated with a particular ecological system within its known geographic range, portions of that ecological system may occur outside of the species’ known geographic range.

    Literature Cited
    • Adams, R.A.  2003.  Bats of the Rocky Mountain West; natural history, ecology, and conservation.  Boulder, CO: University Press of Colorado.  289 p.
    • Dobkin, D. S.  1992.  Neotropical migrant land birds in the Northern Rockies and Great Plains. USDA Forest Service, Northern Region. Publication No. R1-93-34.  Missoula, MT.
    • Foresman, K.R.  2001.  The wild mammals of Montana.  Special Publication No. 12.  Lawrence, KS: The American Society of Mammalogists.  278 p.
    • Hart, M.M., W.A. Williams, P.C. Thornton, K.P. McLaughlin, C.M. Tobalske, B.A. Maxell, D.P. Hendricks, C.R. Peterson, and R.L. Redmond. 1998.  Montana atlas of terrestrial vertebrates.  Montana Cooperative Wildlife Research Unit, University of Montana, Missoula, MT.  1302 p.
    • Hutto, R.L. and J.S. Young.  1999.  Habitat relationships of landbirds in the Northern Region, USDA Forest Service, Rocky Mountain Research Station RMRS-GTR-32.  72 p.
    • Maxell, B.A.  2000.  Management of Montana’s amphibians: a review of factors that may present a risk to population viability and accounts on the identification, distribution, taxonomy, habitat use, natural history, and the status and conservation of individual species.  Report to U.S. Forest Service Region 1.  Missoula, MT: Wildlife Biology Program, University of Montana.  161 p.
    • Werner, J.K., B.A. Maxell, P. Hendricks, and D. Flath.  2004.  Amphibians and reptiles of Montana.  Missoula, MT: Mountain Press Publishing Company. 262 p.

Food Habits
No information specific to Montana is available. Based upon general information, these lagomorphs are known to forage on herbaceous vegetation such as grasses and forbs during the spring and summer, but switch to the buds, bark, and leaves of woody plants in the fall and winter (Foresman 2012). Water is obtained through consumed vegetation; an individual's diet is 68% water at minimum (Nagy et al. 1976). Because the diet of Black-tailed Jack Rabbits is often low in nutrients, additional water, protein, and vitamins have to be obtained through coprophagy - the consumption of fecal pellets (Steigers et al. 1982, Foresman 2012). Young are known to consume the pellets of their mother. These soft pellets are produced while resting during the day, swallowed whole, and re-digested. An adult can consume as much as 390 grams of forage each day (Johnson and Peek 1984) and will produce, on average, 545 pellets (Arnold and Reynolds 1943).

Ecology
Black-tailed Jack Rabbits are sympatric with Lepus townsendii in Beaverhead County (Hoffmann and Pattie 1968). They are true hares with precocial young. They are considered both a "desirable" (food, recreation) and "undesirable" (crop damage, competition with livestock) species (Dunn et al. 1982).

As with other species of rabbits and hares, L. californicus populations are known to fluctuate markedly, with alternating periods of local population increases and declines. Although these cycles can be rather dramatic, they appear to be considerably lower in magnitude than the frequently cited example of the Snowshoe Hares (L. americanus) (Gross et al. 1974). It is not likely that individuals in the wild survive more than seven years.

During the day, individuals rest in shallow depressions under vegetation called forms (Best 1996). These structures measure 10 to 20 centimeters in width, 30 to 45 centimeters in length, and 3 to 11 centimeters in depth. Both pre-existing forms as well as those excavated by individuals are commonly used, and adults will rarely enter burrows for shelter. Black-tailed Jack Rabbits are mostly solitary, but occasionally form small groups at good foraging sites (Foresman 2012a). Aggressive behavior is uncommon, but males are known to "box" with one another (Hoffmeister 1986). This behavior, characterized by standing up on the hind legs and hitting with the forelimbs, along with ear biting is the most aggressive form of social behavior, but individuals are also known to butt heads and chase each other short distances (Tiemeier 1965).

The characteristic long ears of the species demonstrate geographical variation in size occurring according to Allen's Rule (Griffing 1974). This general 'rule' predicts that external appendages such as ears will be enlarged in warmer climates to facilitate radiation of heat back into the air. The ears of L. californicus, on average, are larger in warmer climates than the ears of populations of L. californicus here in Montana.

L. californicus is well suited for a jumping style of locomotion. Individuals casually will move at a rate of 1.5 to 3 meters per jump, but can cover up to 10 meters when disturbed (Foresman 2012). L. californicus can move at speeds of up to 56 kilometers per hour and jump as high as 1.5 meters.

Individuals may be host to a large number of diseases or disease carrying microorganisms such as Borrelia burgdorferi, Toxoplasma gondii, Coxiella burnetti, Paturella tularensis, Pasturella pestis, Yersinia pseudotuberculosis, and others (Best 1996). Adult mortality in Idaho was reported to be as high as 87% during the breeding season and as high as 67% during the remainder of the year (Gross et al. 1974). Years of population increase saw yearly mortality rates as low 64%, and years of population decrease had rates as high as 90%.

Reproductive Characteristics
There is no information available specific to the state of Montana. Information gathered in other areas of the species' range suggests that breeding among Black-tailed Jack Rabbits is promiscuous. Receptive females will often copulate with the first interested male after a lengthy courtship behavior (Haskell and Reynolds 1947). This process, which can last from 5 to 20 minutes, consists of circling, chasing, jumping, and urinating, almost always followed by copulation, which often occurs more than once.

Nests are thickly lined with fur and entered through a small opening at the surface. Where the topsoil is hard, nests are no more than excavated forms beneath clumps of grass or brush (Vorhies and Taylor 1933). Local populations of L. californicus have synchronized copulation periods within each breeding season (Gross et al. 1974). Copulation is followed by ovulation and a gestation period of approximately 40 days. Young are born weighing approximately 66 grams with a complete set of teeth, coat of fur, and open eyes (Haskell and Reynolds 1947). By the third day after birth the young exhibit 'considerable coordination', and begin digging on the fourth day.

The duration of the breeding season and the size of each litter vary with geographic location (Gross et al. 1974). In northern Utah, where the breeding season consists of 190 days (enough time for four to five litters), the average litter size was 3.8. In contrast, in southern Arizona, where the breeding season lasts 300 days (enough time for seven separate litters), the average litter size was 2.24. Thus, breeding Black-tailed Jack Rabbits in more northern climates compensate shortened breeding seasons with larger litter sizes. Breeding pairs within local populations show a considerable amount of synchronicity, beginning each copulation period at almost the same time.

Management
No special management activities have been developed or implemented for this species in Montana.

References
  • Additional ReferencesLegend:   View WorldCat Record   View Online Publication
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    • Arnold, J. F., and H. G. Reynolds. 1943. Droppings of Arizona and antelope jackrabbits and the ¿pellet census.¿ The Journal of Wildlife Management 39:152-156.
    • Best, T. L. 1996. Lepus californicus. American Society of Mammalogists, Lawrence, KS. Mammalian Species No. 530:1-10.
    • Caire, W., J. D. Tyler, and B. P Glass. 1989. Mammals of Oklahoma. University of Oklahoma Press, Norman. xiii + 567 pp.
    • Chapman, J. A., and G. A. Feldhamer, editors. 1982. Wild mammals of North America: biology, management, and economics. Johns Hopkins University Press, Baltimore, Maryland.
    • Flinders, J. T. and R. M. Hansen. 1973. Abundance and dispersion of Leoprids within a shortgrass ecosystem. J. Mammal. 54:287-29.
    • Flinders, J. T. and R. M. Hansen. 1975. Spring population responses of cottontails and jackrabbits to cattle grazing shortgrass prairie. Journal of Range Management 28(4):290-293.
    • Foresman, K. R. 2001. Key to the mammals of Montana. University of Montana Bookstore, Missoula, Montana. 92 p.
    • Foresman, K. R. 2001. The wild mammals of Montana. American Society of Mammologists, Special Publication Number 12. Lawrence, KS. 278 p.
    • Giddings, Brian., 1986, Ecology of the bobcat in a prairie rangeland-agricultural environment in eastern Montana.
    • Griffing,, J. P. 1974. Body measurements of the black-tailed jackrabbits of southeastern New Mexico with implications of Allen's Rule. Journal of Mammalogy 55:674-678.
    • Gross, J. E., L. C. Stoddart, and F. H. Wagner. 1974. Demographic analysis of a northern Utah jackrabbit population. Wild. Mono. No. 40. The Wildlife Society, Inc. 72 pp.
    • Hall, E. R. 1981. The mammals of North America, volumes I and II. John Wiley & Sons, New York, NY. 1181 p.
    • Harestad, A. S. and F. L. Bunnell. 1979. Home range and body weight - a reevaluation. Ecology 60:389-402.
    • Haskell, H. S., and H. G. Reynolds. 1947. Growth, developmental food requirements, and breeding activity of the California jack rabbit. Journal of Mammalogy 28:129-136.
    • Hoffmann, R. S. and D. L. Pattie. 1968. A guide to Montana mammals: identification, habitat, distribution, and abundance. University of Montana, Missoula. 133 p.
    • Hoffmeister, D. F. 1986. Mammals of Arizona. Univ. Arizona Press and Arizona Game and Fish Dept. 602 pp.
    • Johnson, D. R., and J. M. Peek. 1984. The black-tailed jackrabbit in Idaho: life history, population dynamics, and control. University of Idaho, College of Agriculture Cooperative Extension Service Bulletin 637:1-6.
    • Johnson, M. K. and R. M. Hansen. 1979. Foods of cottontails and woodrats in southcentral Idaho. J. Mammal. 60:213-215.
    • Jones, J. K., D. M. Armstrong, R. S. Hoffmann and C. Jones. 1983. Mammals of the northern Great Plains. University of Nebraska Press, Lincoln. 379 p.
    • Leopold, A. S. 1959. Wildlife of Mexico. University of California Press, Berkeley.
    • MacCracken, J. G, and R. M. Hansen. 1982. Herbaceous vegetation ofhabitat used by Blacktail Jackrabbits and Nuttall Cottontails in southeastern Idaho. American Midland Naturalist 107:180-184.
    • Nagy, K. A., V. H. Shoemaker, and W. R. Costa. 1976. water, electrolyte, and nitrogen budgets in jackrabbits (Lepus californicus) in the Mojave Desert. Physiological Zoology 49: 351-363.
    • Reid, F. 2006. Peterson Field Guide to Mammals of North America, 4th Edition. Houghton Mifflin Company: Boston and New York, 608 pp.
    • Smith, G.W. 1990. Home range and activity patterns of black-tailed jackrabbits. Great Basin Nat. 50:249-256.
    • Steigers, W. D., Jr., J. T. Flinders, and S. M. White. 1982. Rhythm of fecal production and protein content for black-tailed jackrabbits. The Great Basin Naturalist 42:567-571
    • Taylor, W. P., and D. W. Lay. 1944. Ecological niches occupied by rabbits in eastern Texas. Ecology 25: 120-121.
    • Tiemeier, O. W. 1965. Bionomics. P. 5-37. In: The black-tailed jackrabbit in Kansas. Kansas State Univ. Agr. Exp. Sta. Tech. Bull. 140.
    • Vorhies, C. T. 1945. Water requirements of desert animals in the southwest. University of Arizona, Agricultural Experiment Station, Technical Bulletin, 107:485-525.
    • Vorhies, C. T., and W. P. Taylor. 1933. The life histories and ecology of jack rabbits, Lepus alleni and Lepus californicus ssp., in relation to grazing in Arizona. University of Arizona, College of Agriculture, Agricultural Experiment Station, Technical Bulletin 49:471-587.
    • Wilson, D. E., and D. M. Reeder (editors). 1993. Mammal Species of the World: a Taxonomic and Geographic Reference. Second Edition. Smithsonian Institution Press, Washington, DC. xviii + 1206 pp.
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Citation for data on this website:
Black-tailed Jack Rabbit — Lepus californicus.  Montana Field Guide.  Montana Natural Heritage Program and Montana Fish, Wildlife and Parks.  Retrieved on July 22, 2014, from http://FieldGuide.mt.gov/detail_AMAEB03050.aspx
 
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