Nepedia
Back to Discover
Advanced Reader
🧬

Western grey kangaroo

life science Maturity 5-7 Next article →

The western grey kangaroo, known scientifically as Macropus fuliginosus, is a large and widespread marsupial. It is one of the biggest macropods, or large-footed animals, found in Australia. These kangaroos are common throughout most of southern Australia. Their range stretches from Shark Bay in Western Australia to Victoria. They also live throughout the entire Murray–Darling basin in New South Wales and Queensland. Because they are so common, they are vital to the ecosystems they inhabit.

Grey Roo with Joey SMC 2006
Grey Roo with Joey SMC 2006

To understand how these animals live, we must look at their unique biology. They are nocturnal, which means they are most active during the night. They primarily eat grasses and forbs, but they also consume leafy shrubs and low trees. One interesting way they survive is through thermoregulation, or the ability to control their body temperature. They vary their core body temperature based on the temperature of the air around them. In the summer, their lowest daily body temperature can be 2.2 °C lower than on cooler spring days. This drop in temperature helps them conserve energy when food is scarce.

Macropus Fuliginosus feeding
Macropus Fuliginosus feeding

The western grey kangaroo has several distinct physical traits and subspecies. They exhibit sexual dimorphism, meaning males and females look different. In fact, a male can be up to twice the size of a female. Their fur is thick and coarse, ranging from pale grey to brown. They often have darker fur around the head and a blackish patch near the elbow. There are two recognized subspecies of this kangaroo. The first is Macropus fuliginosus fuliginosus, which is endemic to Kangaroo Island. The second is Macropus fuliginosus melanops, which lives on the mainland.

Grey Roo with Joey SMC 2006
Grey Roo with Joey SMC 2006

Learning about this species involved a long period of taxonomic confusion. Taxonomy is the science of naming and classifying living things. European explorers first noted them in 1802 when Matthew Flinders landed on Kangaroo Island. Flinders mistakenly thought they were eastern grey kangaroos. In 1803, French explorers captured several and sent them to Paris. It was not until 1817 that researchers at the Paris Museum of Natural History formally described them as a separate species. For many years, scientists were still confused. In 1888, they incorrectly claimed the species lived in Tasmania. It took until 1924 to realize that the Tasmanian "forester kangaroo" was actually the eastern grey kangaroo.

Macropus Fuliginosus feeding
Macropus Fuliginosus feeding

Reproduction in this species follows a specific cycle. The gestation period, or the time the baby develops inside the mother, lasts 30 to 31 days. After birth, the baby, called a joey, attaches to a teat in the pouch. The joey stays in the pouch for 130 to 150 days. Females reach sexual maturity at 17 months, while males take about 20 months. Socially, they live in groups of up to 15 individuals. During the breeding season, males engage in "boxing" contests. They lock arms and attempt to push their rivals over to establish dominance.

Grey Roo with Joey SMC 2006
Grey Roo with Joey SMC 2006

The western grey kangaroo has a complex relationship with the eastern grey kangaroo. While their ranges overlap in the Murray–Darling basin, they rarely interbreed in the wild. However, scientists have observed a phenomenon called unidirectional hybridisation in captivity. This means that viable offspring are only produced when an eastern grey female mates with a western grey male. In terms of population, the species is currently classified as Least Concern by the IUCN Red List. In 2020, the population in commercial harvest areas was estimated at approximately 3,800,000 individuals.

Macropus Fuliginosus feeding
Macropus Fuliginosus feeding

Humans interact with these kangaroos in several economic and agricultural ways. Because they eat grass and shrubs, some ranchers view them as competitors for pasture and water. In some areas, they are considered pests, and controlled culling is allowed under license. There is also a commercial industry for their meat and skin. About 40% of the harvested meat is used for human food. Their skins provide high-quality leather used for items like belts, handbags, and briefcases. While hunting is permitted in parts of Western Australia and New South Wales, it is prohibited on Kangaroo Island and in Tasmania.

Grey Roo with Joey SMC 2006
Grey Roo with Joey SMC 2006
666 words

Where will your curiosity go next?

Keep exploring at your chosen reading level.

🖼️ Images & Media (2)
File:Grey Roo with Joey SMC 2006.jpg
Grey Roo with Joey SMC 2006.jpg
File:Macropus Fuliginosus feeding.JPG
Macropus Fuliginosus feeding.JPG
More to explore

🔬 Go deeper

More advanced topics to explore

🪜 Step back

Simpler topics to build understanding

What is Nepedia?

A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.