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Description

Red Kangaroo
(Macropus rufus)

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.[citation needed] 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.[14][15] 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.

Kangaroos have large, powerful hind legs, large feet adapted for leaping, a long muscular tail for balance, and a small head. Like all marsupials, female kangaroos have a pouch called a marsupium in which joeys complete postnatal development.

Behaviour

Kangaroos are the only large animals to use hopping as a means of locomotion. The comfortable hopping speed for Red Kangaroo is about 20–25 km/h (13–16 mph), but speeds of up to 70 km/h (44 mph) can be attained, over short distances, while it can sustain a speed of 40 km/h (25 mph) for nearly two kilometres.[16] This fast and energy-efficient method of travel has evolved because of the need to regularly cover large distances in search of food and water, rather than the need to escape predators.[citation needed]

Because of its long feet, it cannot walk correctly. To move at slow speeds, it uses its tail to form a tripod with its two forelimbs. It then raises its hind feet forward, in a form of locomotion called "crawl-walking."[16]

The average life expectancy of a kangaroo is about 4–6 years.[17]

Diet

 

An Eastern Grey feeding in native grassland

Different species of kangaroos have different diets, although all are strict herbivores. The Eastern Grey Kangaroo is predominantly a grazer eating a wide variety of grasses whereas some other species (e.g. the Red Kangaroo) include significant amounts of shrubs in the diet. The smaller species of kangaroos also consume hypogeal fungi. Many species are nocturnal[18] and crepuscular,[19] usually spending the days resting in shade and the cool evenings, nights and mornings moving about and feeding.

Because of its grazing, kangaroos have developed specialized teeth. Its incisors are able to crop grass close to the ground, and its molars chop and grind the grass. Since the two sides of the lower jaw are not joined together, the lower incisors are farther apart, giving the kangaroo a wider bite. The silica in grass is abrasive, so kangaroo molars move forward as they are ground down, and eventually fall out, replaced by new teeth that grow in the back.[16]
 

Reproduction and life cycle

Kangaroo reproduction is similar to that of opossums. The egg (still contained in the evolutionary remnant of a shell, a few micrometres thick, and with only a small quantity of yolk within it) descends from the ovary into the uterus. There it is fertilised and quickly develops into a neonate. Even in the largest kangaroo (the red kangaroo) the neonate emerges after only 33 days. Usually only one young is born at a time. It is blind, hairless and only a few centimetres long; its hind legs are mere buds but uses its better developed forelegs to haul its way through the thick fur on its mother's abdomen in to the pouch, which takes about three minutes. Once there, it fastens on to one of four teats and starts to feed. Almost immediately, the mother's sexual cycle starts again. Another egg descends into the uterus and she becomes sexually receptive. Then, if she mates and a second egg is fertilised, its development is temporarily halted. Meanwhile, the neonate in the pouch grows prodigiously. After ca. 190 days, the baby (called a joey) is sufficiently large and independent to make its first foray out of the pouch. From then on it spends increasing time in the outside world and eventually, after ca. 235 days, it leaves the pouch for the last time.[27]

 

 

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Purdy's Petting Zoo

120 Plemons Road
Sweetwater, TN 37874
423-295-5156

mpurdy@compurdy.com

Family owned and operated by :Mark , Melissa, Landon & Darrah Purdy

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Last modified: 07/20/10