Red Kangaroo

About the red kangaroo

The red kangaroo is the largest of all kangaroos, the largest land mammal native to Australia, and the largest living marsupial anywhere. It was first formally described in 1822, and its taxonomic placement has shifted over time — most recently, a 2015 restructuring, later supported by genetic analysis in 2019, moved the species back into the genus Osphranter after decades classified within Macropus.

The species is strikingly sexually dimorphic. Males, known in Australia as "Big Reds," carry short red-brown fur that fades to pale buff on the belly and limbs, while females are smaller and blue-grey with a brownish tinge, though females living in arid zones tend to take on coloring closer to the males'. Both sexes share the long, pointed ears and square muzzle typical of the species, along with small-clawed forelimbs, powerful hind limbs built for jumping, and a thick tail often used to form a tripod when standing upright. A large mature male can stand more than 5 ft 11 in tall, and the largest confirmed individual on record stood around 6 ft 11 in and weighed 201 lb.

Locomotion is built around an efficient, spring-like system: the Achilles tendon stretches on landing and releases that stored energy to propel the animal forward, producing the kangaroo's distinctive bouncing gait. Red kangaroos can reach speeds of around 37 mph, and males can cover 26–30 feet in a single leap, clearing obstacles 5 ft 11 in to nearly 10 feet high, though average jumps are more modest. Their eyes, positioned for a wide field of view of roughly 300 degrees, give them strong peripheral awareness of approaching threats. To cope with extreme heat, red kangaroos rely on an insulating coat, reduced daytime activity, panting, sweating, and licking their forelimbs to cool exposed skin, and in the harshest conditions they can enter a state of torpor to conserve energy.

Behavior and diet

Red kangaroos are mostly crepuscular and nocturnal, resting in shade through the heat of the day, though they will move about during daylight at times. Grazing takes up the bulk of their active hours. They typically live in small, flexible groups of two to four, most often females with their young, though much larger aggregations — sometimes numbering as many as 1,500 individuals — can form where forage is especially abundant. Males, called boomers, are not territorial and fight only over females, called flyers, that come into season; young males in particular engage in a ritualized form of boxing, rearing up on their hind legs and using their tail for balance while jabbing, locking forearms, and kicking to establish dominance.

Diet is centered on green vegetation — fresh grasses, forbs, and other flowering plants make up the large majority of intake, with one study finding green grass at 75–95% of the diet in Central Australia. Kangaroos will also browse chenopods and shrubs when their preferred grasses turn scarce during dry periods, and they are able to find enough moisture in the vegetation itself to go long stretches without drinking, aided by kidneys that concentrate urine efficiently.

Reproduction is where the species shows some of its most distinctive marsupial adaptations. Red kangaroos breed year-round, and females can delay the birth of a new joey through embryonic diapause until an older joey has left the pouch — meaning a female may be pregnant almost constantly and can, at times, have three generations of offspring in progress simultaneously: one suckling outside the pouch, one attached to a teat inside it, and a paused embryo waiting in the uterus. After a gestation of only 33 days, a tiny, blind, hairless neonate climbs unaided into the pouch, where it attaches to a teat and grows for roughly 190 days before it starts poking its head out, then fully leaves the pouch around 235 days, continuing to nurse until about a year old. Females may first breed as early as 18 months of age, or as late as five years during drought, though normally begin around two and a half years old.

Range and habitat

Red kangaroos range across western and central mainland Australia, avoiding the more fertile parts of southern Western Australia, the eastern and southeastern coastal strip, and the rainforests along the northern coast. Their habitat spans scrubland, grassland, and desert, generally favoring open country with some trees for shade; for shelter in extreme heat they rely on small saltbushes or mulga bushes rather than the rocky outcrops or caves used by some other kangaroo species.

Kangaroos in New South Wales have been recorded with weekly home ranges of 258–560 hectares, with the largest ranges belonging to adult males, and populations will travel 16–19 miles to reach better feeding ground when rainfall is poor and patchy. One study of kangaroos in central Australia found that most individuals stay near remaining vegetation but disperse after rain to find fresh growth.

Conservation status

The red kangaroo is rated Least Concern on the IUCN Red List, in a 2016 assessment that lists it under the name Macropus rufus. The species has, if anything, benefited from the spread of Australian agriculture and the man-made waterholes that came with it, though competition with livestock and rabbits poses a threat. Farmers sometimes shoot red kangaroos as pests, and in Queensland and New South Wales doing so requires a permit.

Commercial harvesting of red kangaroos is legal and regulated under nationally approved management plans intended to keep populations stable while treating the species as a renewable resource. More than half a million were harvested across Australia in 2023 alone. The kangaroo industry, worth about A$270 million annually and employing more than 4,000 people, uses the meat for both human consumption and pet food, and the skins for leather.