Plains Rat

Plains Rat

Plains mouse, Pallyoora, Yarlie

Kingdom
Phylum
Subphylum
Class
Order
Superfamily
Family
Genus
SPECIES
Pseudomys australis
Population size
5-20 Thou
Life Span
1-4.5 yrs
WEIGHT
65 g
LENGTH
90-145 mm

Plains rats are one of the largest rodents in the arid zone of Australia. They have a stocky body with long ears and a rounded muzzle. Fur color is grey to brown along the animal's back with white or cream lining its underbelly. These mice have long ears and a rounded snout and their tail is roughly as long as their body.

Video

Distribution

Plains rats are native to Australia. They occur in five broad geographic zones: the Arcoona Tableland, South Australia; the Southern Lake Eyre region, South Australia; the Moon Plain region, South Australia; the Oodnadatta region (including Witjira National Park), South Australia/Northern Territory; and the Andado Station and Mac Clark Conservation Reserve, Northern Territory. These animals inhabit gibber deserts (stony deserts), flood plains, with low shrubs and hard clayplains.

Plains Rat habitat map

Geography

Climate zones

Habits and Lifestyle

Plains rats are social animals. During non-breeding periods males and females live together in colonies of up to 20 individuals; however, during breeding periods one male occupies a burrow with up to three females. During breeding cycles males become very agitated and both sexes are known to stand on their hind feet and squeal loudly when threatened. Plains rat construct a complex system of shallow connected tunnels beneath the cracking clay of gibber plains, emerging only at night to feed. The home range of an adult is roughly 1.6 hectares.

Seasonal behavior

Diet and Nutrition

Plains rats are mainly herbivorous. They feed on seeds, stems and ocassionally arthropods.

Mating Habits

MATING BEHAVIOR
REPRODUCTION SEASON
year-round
PREGNANCY DURATION
30-31 days
BABY CARRYING
4 pups
INDEPENDENT AGE
28 days
FEMALE NAME
doe
MALE NAME
buck
BABY NAME
pup, pinkie, kit

Plains rats are polygynous. This means that males have many partners during a breeding season. These rats don't have a regular breeding season and usually reproduce after a period of rainfall. Females give birth to four young; however up to seven young can be produced in one litter. The gestation period lasts 30-31 days. During lactation, females can be seen dragging their young as they each latch to one of the four teats located on mother's underbelly. The young become weaned at around 28 days after birth and reach reproductive maturity at 8-10 weeks of age.

Population

Population threats

Main threats to Plains rats are habitat degradation, introduced predators and drought. Habitat degradation mainly derives from introduced hoofed stock and land clearing. Hoofed stock lessen vegetation cover, crush the seed bank and trample burrows while land clearing removes food sources vital to the survival of the Plains rat. Reduced vegetation cover and damaged burrows only makes it easier for introduced predators such as the European fox and Feral cat to excavate shallow burrows. This can contribute to local extinctions, particularly when populations are already low during periods of drought. Other potential threats to Plains rat include altered fire regimes, leading to increased intensity of bushfires; competition with the introduced House mouse and European rabbit and climate change.

Population number

According to the IUCN Red List, the total population size of Plains rats is 5,000-20,000 mature individuals. This species’ numbers are decreasing and it is currently classified as Vulnerable (VU) on the IUCN Red List.

References

1. Plains Rat on Wikipedia - https://en.wikipedia.org/wiki/Plains_rat
2. Plains Rat on The IUCN Red List site - https://www.iucnredlist.org/species/75927871/115493152

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