Geographic Range
Kultarrs,
Antechinomys laniger
, are endemic to Australia. They are found in Northern Australia, Western Australia,
and New South Wales. Localized extinctions of this species have been detected in New
South Wales and South Australia. There are two regional subspecies of kultarrs.
Antechinomys laniger laniger
is located in the eastern part of the overall species range, and
A. l. spenceri
in the central and western parts of this range.
- Biogeographic Regions
- australian
Habitat
Kultarrs inhabit arid to semi-arid plains. They prefer heavy soils including stoney,
sandy, or clay filled soils. During the day, they seek cover in stumps, spinifex tussocks,
cracks in the soil, and burrows of other animals.
Antechinomys laniger laniger
prefers claypans in Acacia woodlands, while
A. l. spenceri
prefers plains of granite and shrub lands.
- Habitat Regions
- temperate
- terrestrial
- Terrestrial Biomes
- savanna or grassland
- forest
- scrub forest
Physical Description
Kultarrs are small and mouse-like in appearance. The pelt is grey to sandy brown, and the long tail has brush-like dark hairs on the sides. The dark coloring around the eyes, mid-line, and top of the head varies among individuals. They are primarily nocturnal and, as such, have large round eyes and enlarged ears. They have elongated hind feet with four independent digits.
Kultarrs weigh 20 to 30 g and measure 170 to 200 mm in length. They exhibit sexual
dimorphism with males being about 15 mm longer and 10 g heavier than females.
- Other Physical Features
- endothermic
- bilateral symmetry
- Sexual Dimorphism
- male larger
Reproduction
Little is known about mating systems of Kultarrs. It is suspected that olfactory cues
are used in mate selection.
Kultarrs are a polyoestrous mammals, and females may enter oestrus up to 6 times during
the breeding season. Oestrus cycles occur from July to January and may be photo-dependent.
The long breeding season runs from midwinter to midsummer. Breeding females have a
supple pouch, elongated nipples, and long red-brown hairs. Males begin spermatorrheoea
in May. Kultarrs have 1 to 8 offspring (average 6). Gestation lasts 12 to 17 days.
After birth, the young crawl into the pouch, where they remain for 30 to 48 days.
Weening occurs at 80 to 90 days of age in captivity. After the breeding season, the
female's pouch regresses into a small fold. Kultarrs reach sexual maturity at 11.5
months of age.
- Key Reproductive Features
- iteroparous
- seasonal breeding
- gonochoric/gonochoristic/dioecious (sexes separate)
- sexual
- fertilization
- viviparous
Female kultarrs feed and protect the offspring in their pouch for 30 to 48 days. After
they are weaned, young remain in the nest as the mother forages. When older, they
ride on their mother's back as she searches for food.
- Parental Investment
- female parental care
-
pre-hatching/birth
-
provisioning
- female
-
protecting
- female
-
provisioning
-
pre-weaning/fledging
-
provisioning
- female
-
protecting
- female
-
provisioning
-
pre-independence
-
provisioning
- female
-
protecting
- female
-
provisioning
Lifespan/Longevity
Kultarrs are relatively long lived mammals for their size. Lifespan may be impacted
by their ability to enter spontaneous torpor. The oldest known Kultarr lived 67 months
in the wild, while the oldest in captivity lived 48 months.
Behavior
Kultarrs move with a bounding gait, alternating using their lengthened hind feet and their smaller front paws. The maximum recorded speed of this species is 13.8 km/hr. Their motion provides high maneuverability, which may aid in catching quick or dangerous prey and avoiding predators.
Kultarrs are rarely observed by humans because they are solitary and nocturnal. Entering
spontaneous torpor as well as times of peak activity are temperature dependent. At
colder temperatures, kultarrs are more active and enter torpor earlier in the night.
This may be linked to energy expenditure for homeostasis and food availability.
Home Range
Little is known regarding the home range of kultarrs.
Communication and Perception
Kultarrs utilize olfactory cues during mate selection. Parents and offspring also
communicate vocally. Young use calls to locate their parents when they become separated.
Kultarrs have abnormally large eyes and ears that are adapted to their nocturnal and
fossorial lifestyle.
Food Habits
Kultarrs are insectivorous and feed mostly on
spiders
,
cockroaches
, and
crickets
. Their agility and speed allow them to catch quick and poisonous prey.
- Primary Diet
- carnivore
- Animal Foods
- insects
- terrestrial non-insect arthropods
Predation
Primary predators of kultarrs include
feral cats
and
red foxes
. Their nocturnal lifestyle and agility help them to avoid many predators. During
the day, kultarrs stay in the nest to avoid diurnal predators. Juveniles stay safe
in the pouch or nest. When juveniles do leave the nest, they attach to their mother's
back.
Ecosystem Roles
Kultarrs may affect populations of the insects they prey upon.
Economic Importance for Humans: Positive
There are no known direct benefits of kultarrs on humans. They may affect populations of pest insects they prey upon.
Economic Importance for Humans: Negative
There are no known adverse effects of kultarrs on humans.
Conservation Status
Antechinomys laniger
is considered a species of Least Concern by the IUCN. It is widespread, and populations
are believed to fluctuate with rain levels. The US Fish & Wildlife service, however,
listed this species as endangered in 1970. Over-grazing by cattle and sheep as well
as predation by feral cats and red foxes are major threats, and localized extinctions
have occurred. Changes in fire regime also negatively affect kultarrs. Protection
of land and animal control programs have helped conserve this species. However, additional
research on food habits, home range, and movement are necessary for more specific
management programs.
Other Comments
Antechinomys laniger
has many common names, including kultarr, Jerboa-marsupial, Jerboa marsupial mouse,
wuhl-wuhl, and pitchi-pitchi.
Additional Links
Contributors
Everett Beck (author), University of Wisconsin-Stevens Point, Christopher Yahnke (editor), University of Wisconsin-Stevens Point, Gail McCormick (editor), Animal Diversity Web Staff.
- Australian
-
Living in Australia, New Zealand, Tasmania, New Guinea and associated islands.
- native range
-
the area in which the animal is naturally found, the region in which it is endemic.
- temperate
-
that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).
- terrestrial
-
Living on the ground.
- tropical savanna and grassland
-
A terrestrial biome. Savannas are grasslands with scattered individual trees that do not form a closed canopy. Extensive savannas are found in parts of subtropical and tropical Africa and South America, and in Australia.
- savanna
-
A grassland with scattered trees or scattered clumps of trees, a type of community intermediate between grassland and forest. See also Tropical savanna and grassland biome.
- temperate grassland
-
A terrestrial biome found in temperate latitudes (>23.5° N or S latitude). Vegetation is made up mostly of grasses, the height and species diversity of which depend largely on the amount of moisture available. Fire and grazing are important in the long-term maintenance of grasslands.
- forest
-
forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.
- scrub forest
-
scrub forests develop in areas that experience dry seasons.
- iteroparous
-
offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).
- seasonal breeding
-
breeding is confined to a particular season
- sexual
-
reproduction that includes combining the genetic contribution of two individuals, a male and a female
- fertilization
-
union of egg and spermatozoan
- viviparous
-
reproduction in which fertilization and development take place within the female body and the developing embryo derives nourishment from the female.
- female parental care
-
parental care is carried out by females
- nocturnal
-
active during the night
- motile
-
having the capacity to move from one place to another.
- solitary
-
lives alone
- acoustic
-
uses sound to communicate
- chemical
-
uses smells or other chemicals to communicate
- visual
-
uses sight to communicate
- tactile
-
uses touch to communicate
- acoustic
-
uses sound to communicate
- chemical
-
uses smells or other chemicals to communicate
- carnivore
-
an animal that mainly eats meat
- insectivore
-
An animal that eats mainly insects or spiders.
- endothermic
-
animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.
- bilateral symmetry
-
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
References
Geiser, F. 1986. Thermoregulation and Torpor in the Kultarr Antechinomys laniger Marsupiala Dasyuridae. Journal of Comparitive Physiology B Biochemical Systematic Physiology , 156(5): 751-757.
Geiser, F., R. Baudinette, T. Garland Jr.. 1990. The Relationship Between Body Mass and Rate of Rewarming from Hibernation and Daily Torpor in Mammals. Journal of Experimental Biology , 151: 349-359. Accessed February 23, 2012 at http://jeb.biologists.org/content/151/1/349.full.pdf+html .
Geiser, F. 2003. Thermal Biology and Energetics of Carnivorous Marsupials. Pp. 247 in Predators with Pouches . Australia: CSIRO Publishing.
Morris, K., J. Woinarski, M. Ellis, T. Robinson, P. Copley. 2011. "Antechinomys laniger" (On-line). In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.1. Accessed February 17, 2012 at http://www.iucnredlist.org/apps/redlist/details/1581/0 .
Stannard, H., J. Old. 2010. Observation of Reproductive Strategies of Captive Kultarrs (Antechinomys laniger). Australian Mammalogy , 32: 179-182.
Strahan, R. 1995. Mammals of Australia . Washington D.C.: Smithsonian Institution Press.
Woolley, P. 1984. Reproduction in Antechinomys laniger ("spenceri" form) (Marsupialia: Dasyuridae): Field and laboratory investigations.. Australian Wildlife Research , 11(3): 481-489. Accessed February 21, 2012 at http://md1.csa.com/partners/viewrecord.php?requester=gs&collection=ENV&recid=962454&q=Antechinomys+laniger&uid=&setcookie=yes .
Department of Substainability, Environment, Water, Population and Communities. Action Plan for Australian Marsupials and Monotremes. Canberra, Australia: Department of Substainability, Environment, Water, Population and Communities. 1996. Accessed March 01, 2012 at http://www.environment.gov.au/biodiversity/threatened/publications/action/marsupials/30.html .
Department of Environment and Conservation (NSW). Kultarr - profile. Hurtsville, New South Wales: Department of Environment and Conservvation (NSW). 2001. Accessed February 23, 2012 at http://threatenedspecies.environment.nsw.gov.au/tsprofile/profile.aspx?id=10057 .
NSW National Parks and Wildlife. Kultarr. Hurtsville, New South Wales: NSW National Parks and Wildlife Service. 1999. Accessed February 20, 2012 at http://www.environment.nsw.gov.au/resources/nature/tsprofileKultarr.pdf .