Damon Mcknight
The kangaroo is a recognisable symbol of Australia, featured on the country's coat of arms and currency. Kangaroos are marsupials, meaning they have pouches where their young, called joeys, are reared. There are several species of kangaroo, including the red kangaroo, eastern grey kangaroo, and western grey kangaroo. Red kangaroos are the largest species, with males weighing up to 92 kg and standing over 6 feet tall. They are characterised by their reddish-brown fur, long pointed ears, and square-shaped muzzle. Eastern grey kangaroos are found in the open forests of eastern Australia and Tasmania, while western grey kangaroos are found in denser vegetation in Western Australia and Victoria. All kangaroos have long, powerful hind legs and feet for hopping and leaping, with the largest species using their tails as a third leg when standing still.
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What You'll Learn
The red kangaroo is the largest species
Red kangaroos are found throughout the semi-arid and arid regions of mainland Australia, preferring flat open plains. They inhabit grassland, shrubland, desert, woodland, and open forest, and are most common in open savanna woodland. They are herbivores, primarily grazing on grasses but also eating forbs and leaves from shrubs. They have a high tolerance for consuming plants with high salt content and can survive for long periods without water by reabsorbing water from their urine in the kidneys, minimising water loss.
Red kangaroos are capable of reaching high speeds of around 60 kilometres per hour (or over 35 miles per hour) through their characteristic bouncing locomotion. Their powerful hind legs allow them to cover 8 to 9 metres in a single leap and reach heights of 1.8 to 3 metres, with an average of 1.2 to 1.9 metres.
Red kangaroos live in social groups called mobs. Females have one young annually, known as joeys, which are reared in their pouches and drink milk from their mammary glands. Red kangaroos breed all year round, but spring and summer are the most common seasons for births.
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Kangaroos have pouches for their joeys
Kangaroos are marsupials, a group of mammals that evolved from an ancestor with a pouch as an adaptation to a particular problem related to raising offspring. The forward-facing pouch on a female kangaroo, also known as a 'flyer' or a 'doe', is a complex nursery that contains everything a growing joey (baby kangaroo) needs. The joey develops and suckles in the pouch, drinking milk from the mammary glands.
The inside of a kangaroo's pouch is hairless and lined with sweat glands that release antimicrobial liquid to protect the joey from germs. Each of the female's four teats provides different milk for the different stages of the joey's development. After leaving the pouch, the joey is often carried on its mother's back, where it learns important survival skills, such as finding food and avoiding predators.
Female kangaroos give birth to one joey annually, but they can keep extra embryos in a dormant state ('embryonic diapause') until the first joey leaves the pouch. This means that a female kangaroo can have a joey at her feet, one in the pouch, and another in diapause all at the same time. The gestation period for a kangaroo is around 33 days, after which the infant, born the size of a jellybean, climbs into its mother's pouch.
The presence of a pouch allows the joey to be born prematurely, reducing the gestation period. The joey can continue to mature outside the mother's body, with its forelimbs allowing it to crawl from the vagina to the pouch. This evolutionary strategy may have allowed kangaroos to diversify into ecological niches that eutherian mammals, burdened by underdeveloped young, cannot easily occupy.
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They're strong swimmers
Kangaroos are reasonably strong swimmers. Although they are not built for swimming, they can swim short distances comfortably. They have strong tails and powerful hind legs, which they use to swim when motivated to access new pastures or escape predators.
Kangaroos are the world's largest marsupials, with the male red kangaroo being the largest species. They can weigh up to 90 kg and grow to 2 metres tall, while females are smaller and weigh up to 39 kg. Male kangaroos are referred to as 'bucks', and females as 'flyers' or 'does'.
Red kangaroos are found in arid regions of mainland Australia, inhabiting grasslands, shrublands, deserts, woodlands, and open forests. They are herbivores, primarily feeding on grasses, forbs, and leaves of shrubs. Their diet provides them with water and nutritional requirements, allowing them to survive in water-scarce environments.
Eastern Grey Kangaroos, on the other hand, are found in more densely vegetated areas, such as Cape York and Tasmania. These kangaroos can stand over 6 feet tall, with males being larger and more muscular than females.
The strong swimming abilities of kangaroos enable them to travel back and forth between islands and the Australian mainland, showcasing their adaptability and survival skills.
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Kangaroos have large feet and powerful hind legs
Kangaroos are marsupials from the family Macropodidae, which means "large foot". Their large feet and powerful hind legs are used for hopping and leaping, their predominant forms of locomotion. Each long, narrow hind foot has four toes, the large fourth toe bearing most of the animal's weight. The second and third toes are united and merely vestigial, a condition known as syndactyly.
The large feet of kangaroos allow them to leap some 30 feet (9 meters) in a single bound, and travel more than 30 miles (48 kilometers) per hour. The hopping action is linked to their breathing: as the feet leave the ground, air is expelled from the lungs, and bringing the feet forward ready for landing refills the lungs, providing further energy efficiency.
The powerful hind legs of kangaroos work like rubber bands, with the Achilles tendon stretching as the animal comes down, then releasing its energy to propel the animal up and forward, enabling its characteristic bouncing locomotion. They can reach speeds of around 60 km/h (37 mph). The males can cover 8–9 m (26–30 ft) in one leap while reaching heights of 1.8–3 m (5 ft 11 in – 9 ft 10 in), though the average is 1.2–1.9 m (3 ft 11 in – 6 ft 3 in).
Kangaroos also use their strong tails for balance while jumping. This feature is most obvious in the large kangaroos, which use the tail as a third leg when standing still.
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They're most active at dusk and dawn
Kangaroos are most active at dawn and dusk, when they search for food. Their diet consists of grass, leaves, ferns, flowers, fruit and moss. Like cattle, they regurgitate their food, chewing it twice before it passes through their chambered stomach.
Kangaroos are herbivores, and their incisors are adapted to crop grass close to the ground. Their molars chop and grind the grass, and they have a unique dental feature called polyphyodonty, where molars move forward in the mouth and are replaced by new teeth at the back. This process also occurs in elephants and manatees but is rare among other mammals.
The abundance of food is a critical factor in the kangaroo life cycle, especially for the Red Kangaroo, which is the largest of all kangaroos and the largest terrestrial mammal native to Australia. Red Kangaroos can survive in arid environments by conserving water and selecting fresh vegetation. They inhabit grassland, shrubland, desert, woodland and open forest, and their range includes western and central Australia.
Eastern Grey Kangaroos, on the other hand, are found in the open forests of eastern Australia and Tasmania. They have giant tails that help them balance, a feature common among large kangaroos.
Kangaroos are strong swimmers and can swim short distances to access new pastures or escape predators. They are social animals, living in groups called mobs, typically consisting of 50 or more individuals.
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Frequently asked questions
Kangaroos are tall marsupials, standing over 6 feet (2 meters) tall. They have small heads, long, powerful hind legs, small front legs, and long tails. Their tails are used for balance, especially when jumping. They have large feet with four toes each, with the large fourth toe bearing most of the animal's weight. They also have pouches where baby kangaroos, or joeys, are reared.
There are six large species of Australian kangaroos: the eastern grey kangaroo, the western grey kangaroo, the red kangaroo, the antilopine kangaroo, and two species of wallaroo. In a broader sense, "kangaroo" can refer to all 14 species in the genus Macropus, some of which are called wallabies.
The red kangaroo is the largest of all kangaroos, with a body length of up to 1.4 meters and a tail up to 1 meter. Males tend to have red-brown fur, while females are blue-grey with a brown tinge. They have black and white patches on their cheeks and a broad white stripe extending from the corner of the mouth to the ear. Eastern grey kangaroos have giant tails, while western grey kangaroos have complex, high-crowned teeth.
