What are the adaptations of a kangaroo?

Noon in the Australian outback. The air shimmers with heat. Under a scraggly tree, a big red kangaroo lies in the shade, licking its forearms. When evening comes it will stand up and bound away across the plain, barely seeming to try.

A kangaroo’s key adaptations are long, springy back legs and a strong tail (structural), resting in shade by day and feeding when it is cooler (behavioural), and a body that saves water and can pause a pregnancy until conditions are right (physiological). This article focuses on the red kangaroo, the largest kangaroo, which lives in Australia’s dry inland.

What are the main adaptations of a kangaroo?

A kangaroo’s main adaptations are long hind legs and feet built for hopping, a thick tail used as a prop and for balance, dense insulating fur, resting in shade during the hottest hours, cooling itself with saliva on its forearms, getting water from its food, and a pouch with a pregnancy that can be paused. Together they suit a hot, dry, unpredictable land.

Scientists sort adaptations into three types. Structural adaptations are body parts, such as ears or claws. Behavioural adaptations are things the animal does, such as hunting at night. Physiological adaptations happen inside the body, such as how it saves water or heat. Our guide to the three types of adaptation explains each one with more animals.

Red kangaroo adaptations sorted by type

Adaptation	Type	What it does	Source
Long hind legs and feet	Structural	Above 18 km/h, hopping costs less energy than four-legged running	San Diego Zoo fact sheet
Thick tail, 64.5 to 100 cm (2.1 to 3.3 ft)	Structural	A prop when sitting and slow walking; balance when hopping	San Diego Zoo fact sheet
Dense fur, 62 fibres per mm	Structural	Insulates in both hot and cold weather	San Diego Zoo fact sheet
Resting in shade	Behavioural	Avoids the midday heat	San Diego Zoo Wildlife Alliance
Forearm saliva cooling	Behavioural	Spreads saliva to cool blood in large forearm veins	San Diego Zoo fact sheet
Water from food	Physiological	Survives when drinking water is scarce	Australian Museum
Sweating only while moving	Physiological	Saves water when resting	San Diego Zoo fact sheet
Embryonic diapause	Physiological	Pauses a pregnancy until the pouch is free	Australian Museum

What are the kangaroo’s structural adaptations?

The kangaroo’s structural adaptations are long, powerful hind legs with long narrow feet, a thick muscular tail, dense fur and teeth that keep replacing themselves. Its back legs are much longer and stronger than its front legs, and two of its hind toes are joined together by skin, sharing one claw, says the San Diego Zoo Wildlife Alliance fact sheet.

The tail is a fifth limb. Males’ tails are 71 to 100 cm (2.3 to 3.3 ft) long. At speeds below about 6 km/h (3.7 mph), a red kangaroo uses a five-legged walk with its tail as a crutch; faster than that, it hops with both back legs together, says San Diego Zoo Wildlife Alliance. Its maximum stride is thought to be about 6 m (20 ft).

Kangaroos grind tough grass, which wears their teeth down. Worn teeth move forward and drop out while new molars erupt behind them. Four sets of molars erupt in a lifetime, says the fact sheet.

What are the kangaroo’s behavioural adaptations?

The kangaroo’s behavioural adaptations are resting in shade during the heat of the day, being most active after dawn and before dusk, spreading saliva on its forearms to cool down, living in small groups, and ritual “boxing” between young males. Red kangaroos usually live in groups of 2 to 10, with 2 or 3 the average, says San Diego Zoo Wildlife Alliance.

On hot days, red kangaroos seek shade and shelter, which researchers describe as necessary for keeping their temperature under control. They may also stand with the tail pulled under the body, so the tail is shaded and air can flow around them. Red kangaroos spend on average 43.5% of each day searching for, cropping and chewing grass.

What are the kangaroo’s physiological adaptations?

The kangaroo’s physiological adaptations are an energy-saving hop, careful water use and a flexible way of having young. At speeds over 18 km/h (11 mph), hopping uses less energy than running does for a four-legged animal of similar size, says San Diego Zoo Wildlife Alliance. Kangaroos also get much of their water from food and recycle urea in the gut to save water.

Water saving goes further. Red kangaroos sweat only while they are moving and stop when they stop. Even when a kangaroo’s body weight drops by 20%, its blood plasma volume falls by only 8%, says the fact sheet. The Australian Museum says red kangaroos can survive when water is scarce because their food supplies their water needs.

Then there is the pouch. A red kangaroo is pregnant for only about 33 days, and the newborn weighs about 1 g and crawls up to the pouch in about 3 minutes, says San Diego Zoo Wildlife Alliance. A mother can keep a tiny embryo on pause, a trick called embryonic diapause, until her older joey leaves the pouch at around 235 days. She can even make two kinds of milk at once, one for a pouch joey and one for an older joey at foot.

Picture it: a mother kangaroo can have a paused embryo, a joey in the pouch and an older joey by her side, all at the same time.

How do kangaroo adaptations compare with other desert animals?

Kangaroos, camels and kangaroo rats all live in dry places but solve the problem differently. Each one has its own mix of body parts, habits and inner tricks for saving water and staying cool. Compare them in camel adaptations and kangaroo rat adaptations, or see another desert specialist in fennec fox adaptations.

What role do kangaroos play in their ecosystem?

Red kangaroos are big native grazers in Australia’s dry inland. By eating grasses and other plants they shape the vegetation, and they are prey for dingoes, which were introduced to Australia between 3,500 and 12,000 years ago. In droughts, red kangaroo numbers can fall as their food runs short, says the Australian Museum.

The red kangaroo is listed as Least Concern on the IUCN Red List (2016 assessment). If you see wild kangaroos, watch from a distance and never feed them: human food can make them sick and bold.

Myths and facts about kangaroo adaptations

Myth: Kangaroos cannot walk, only hop.

Fact: At slow speeds below about 6 km/h, red kangaroos use a five-legged walk with the tail as a crutch, says San Diego Zoo Wildlife Alliance.

Myth: Kangaroos lick their arms because they are dirty.

Fact: They spread saliva on their forearms so it evaporates and cools the blood in large forearm veins. It is a cooling trick.

Myth: A baby kangaroo is born big and climbs into the pouch to hide.

Fact: A newborn red kangaroo weighs about 1 g, about the size of a jellybean, and must crawl up to the pouch, where it stays for around 235 days.

Test yourself

1. Above what speed is hopping cheaper than four-legged running?

Above about 18 km/h (11 mph).

2. Is spreading saliva on the forearms structural, behavioural or physiological?

Behavioural, because it is something the kangaroo does (the cooling of the blood it causes is physiological).

3. What is embryonic diapause?

Pausing the development of an embryo until the pouch is free.

Frequently asked questions

Sources

1. Australian Museum. Red kangaroo.
2. San Diego Zoo Wildlife Alliance Library. Red kangaroo fact sheet: physical characteristics.
3. San Diego Zoo Wildlife Alliance Library. Red kangaroo fact sheet: behavior and ecology.
4. San Diego Zoo Wildlife Alliance Library. Red kangaroo fact sheet: reproduction and development.
5. IUCN Red List of Threatened Species (2016). Osphranter rufus.

Sources checked 12 October 2026.