kangaroo n : any of several herbivorous leaping marsupials of Australia and New Guinea having large powerful hind legs and a long thick tail

English

Etymology

From gangurru, recorded by James Cook and others in 1770 at Endeavour River; in English, applied to the whole family of macropods, apparently from not realizing the Guugu Yimidhirr word referred to just one species.

In 1820 Phillip King visited the area and could not confirm Cook’s record; some then suggested that Cook and Banks had erred. This is apparently the basis for the long-standing myth that Cook is supposed to have asked a native “What is that?” to which the reply “kangaroo”, supposedly meaning “I don’t know”, was given. Though amusing, this is not the case. John Haviland studied Guugu Yimidhirr extensively in 1972, confirming gangurru and concluding King had been told minha.1

Pronunciation

• /ˌkæŋgəˈru/, /%k

Terminology

The word kangaroo derives from the Guugu Yimidhirr word gangurru, referring to a grey kangaroo. The name was first recorded as "Kangooroo or Kanguru" on 4 August 1770, by Lieutenant (later Captain) James Cook on the banks of the Endeavour River at the site of modern Cooktown, when HM Bark Endeavour was beached for almost seven weeks to repair damage sustained on the Great Barrier Reef.

Overview

There are four species that are commonly referred to as kangaroos:

• The Red Kangaroo (Macropus rufus) is the largest surviving marsupial anywhere in the world. Fewer in numbers, the Red Kangaroo occupies the arid and semi-arid centre of the continent. A large male can be 2 metres (6 ft 7 in) tall and weigh 90 kg (200 lb).
• The Eastern Grey Kangaroo (Macropus giganteus) is less well-known than the red (outside of Australia), but the most often seen, as its range covers the fertile eastern part of the continent.
• The Western Grey Kangaroo (Macropus fuliginosus) is slightly smaller again at about 54 kg (119 lb) for a large male. It is found in the southern part of Western Australia, South Australia near the coast, and the Darling River basin.
• The Antilopine Kangaroo (Macropus antilopinus) is, essentially, the far-northern equivalent of the Eastern and Western Grey Kangaroos. Like them, it is a creature of the grassy plains and woodlands, and gregarious.

Description

Europeans have long regarded kangaroos as strange animals. Early explorers described them as creatures that had heads like deer (without antlers), stood upright like men, and hopped like frogs. Combined with the two-headed appearance of a mother kangaroo, this led many back home to dismiss them as travellers' tales for quite some time. The first kangaroo to be exhibited in the western world was an example shot by John Gore, an officer on Captain Cook's Endeavour in 1770. The animal was shot and its skin and skull transported back to England whereupon it was stuffed (by taxidermists who had never seen the animal before) and displayed to the general public as a curiosity.

Behaviour

Diet

Different species of kangaroos eat different diets. Eastern grey kangaroos are predominantly grazers eating a wide variety of grasses whereas some other species (e.g. red kangaroos and swamp wallabies) include significant amounts of shrubs in the diet. The smaller species of kangaroos also consume hypogeal fungi. Many species are nocturnal and crepuscular, usually spending the days resting in shade and the cool evenings, nights and mornings moving about and feeding.

Predators

Kangaroos have few natural predators. The Thylacine, considered by palaeontologists to have once been a major natural predator of the kangaroo, is now extinct. Other extinct predators included the Marsupial Lion, Megalania and the Wonambi. However, with the arrival of humans in Australia at least 50,000 years ago and the introduction of the dingo about 5,000 years ago, kangaroos have had to adapt. The mere barking of a dog can set a full-grown male boomer into a wild frenzy. Wedge-tailed Eagles and other raptors usually eat kangaroo carrion. Goannas and other carnivorous reptiles also pose a danger to smaller kangaroo species when other food sources are lacking.

Adaptations

Kangaroos have developed a number of adaptations to a dry, infertile continent and highly variable climate. As with all marsupials, the young are born at a very early stage of development – after a gestation of 31–36 days. At this stage, only the forelimbs are somewhat developed, to allow the newborn to climb to the pouch and attach to a teat. In comparison, a human embryo at a similar stage of development would be about seven weeks old, and premature babies born at less than 23 weeks are usually not mature enough to survive. When the joey is born, it is about the size of a lima bean. The joey will usually stay in the pouch for about nine months (180–320 days for the Western Grey) before starting to leave the pouch for small periods of time. It is usually fed by its mother until reaching 18 months.

Hand-raising

Occasionally, individuals take on the task of rearing a recovered joey themselves. The rule-of-thumb says that if the joey is already covered with fur at the time of the accident (as opposed to still being in its embryonic stage), it stands a good chance of growing up properly. Lactose-free milk is required, otherwise the animal may develop blindness. They hop readily into a cloth bag when it is lowered in front of them approximately to the height where the mother's pouch would be. The joey's instinct is to "cuddle up", thereby endearing themselves to their keepers, but after hand-rearing a joey, it cannot usually be released into the wild and be expected to provide for itself immediately. Usually wildlife sanctuaries are willing to adopt kangaroos which are no longer practical, or have grown too large to contain, needing at least 1 acre and 7ft boundary fences for a fully grown kangaroo.

Kangaroo emblems and popular culture

Kangaroos have been featured on coins, as well as being used as emblems and logos. They have also been used as mascots and in the naming of sports teams and are extremely well-represented in films, television, toys and souvenirs around the world.

References

• Dawson, Terence J. 1995. Kangaroos: Biology of the Largest Marsupials. Cornell University Press, Ithaca, New York. Second printing: 1998. ISBN 0-8014-8262-3.
• Flannery, Timothy Fridtjof, et al. 1996. Tree Kangaroos: A Curious Natural History. Reed Books, Melbourne. ISBN 0-7301-0492-3
• Underhill D. 1993. Australia's Dangerous Creatures, Reader's Digest, Sydney, New South Wales, ISBN 0-86438-018-6
• Weldon, Kevin. 1985. The Kangaroo. Weldons Pty. Ltd., Sydney. ISBN 0-949708-22-4

Footnotes

See also

• Embryonic diapause
• Kangaroo (meat)
• Kangaroo court (mock justice)
• Boxing Kangaroo (symbol)
• Kangaroo emblems and popular culture

External links

• The Kangaroo Genome Project at Australian National University
• Courtship and Mating
• Prehistoric mammals