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Photo: Kangaroo male, and female with joey
Kangaroos have unusual sexual and reproductive characteristics. The male has a two-pronged penis. The female has three vaginas and two uteruses and raises her young in a pouch.
Kangaroo Mating How Kangaroos Mate
The male kangaroo reaches sexual maturity at approximately 24 months, and the female at around 16 months. They have no fixed breeding period but will mate more often when food is plentiful than during periods when food is scarce.
When the female is sexually in heat, she will exhibit a particular behaviour signalling that she is receptive. An interested male will sniff her urine and approach her.
It is common for a dominant male to drive off lesser rivals for mating rights. When a male wants to establish mating rights, he will stand on his toes and tail tip and make growling and clucking noises. This signals to others that he is willing to fight for the right to mate. If challenged, a fight will ensure.
Kangaroos fight by kicking each other with their powerful hind legs and by attempting to scratch their opponent with their sharp claws until the vanquished is driven off. They rarely seriously injure each other.
The male will then approach the female, and if she is receptive to him, he will copulate with her. After copulation, the male will move on to another female.
- In Kangaroo Land online pokie you will learn about some facets of Australia while you enjoy the gaming. Kangaroo Land has the standard 5 reels and 3 rows structure. You can play with 1, 5, 10, 15 or 20 paylines activated. Look out for some win animations, especially the leaping kangaroo in the wild symbol.
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Male Kangaroo Reproductive Anatomy Bifurcated Two-pronged Penis
Kangaroo, any of six large species of Australian marsupials noted for hopping and bouncing on their hind legs. The term kangaroo, most specifically used, refers to the eastern gray kangaroo, the western gray kangaroo, and the red kangaroo, as well as to the antilopine kangaroo and two species of wallaroo.
Photo: Male kangaroo penis and scrotum
Photo: Kangaroo two-pronged penis
The male kangaroo penis has two-prongs and is located behind its scrotum. (Most animals have the penis located in front). This two-pronged structure enables the male to inseminate the dual vaginas of the female kangaroo. When flaccid, the penis is withdrawn into the animal's body.
Another adaptation for Australia's harsh environment is that the male kangaroo's body shuts down sperm production during periods of severe drought in order to conserve energy.
Female Kangaroo Reproductive Anatomy Three Vaginas and two Uteruses
As with all marsupials, the female kangaroo has three vaginas and two uteruses (uteri). The two outermost vaginas are used for sperm transportation to the two uteruses. Babies are born through the middle one. (See photo). By contrast, female placental mammals have only one uterus and one vagina.
Photo: Female kangaroo reproduction organs
With this unusual reproductive system, a female kangaroo can be in a continuous state of pregnancy, with a fertilised egg in one uterus waiting to be released, a baby growing in the other uterus, one in her pouch and another hopping outside but coming to its mother for milk. Another unique feature of these animals is that during times of extreme drought and starvation, the female kangaroo can practice birth control by putting the babies growing in her uteruses 'on hold', stopping their future development until conditions improve. This is called embryonic diapause. When the mother's pouch becomes free, the next baby will be born and move into the pouch and the fertilised egg 'on hold' in a uterus will start developing into a new foetus. Because of this multiple-offspring strategy and other adaptabilities unique to the kangaroo, populations can increase rapidly when food is plentiful.
Kangaroo Egg The Kangaroo's Unusual Egg
The kangaroo egg, which is about 0.12 mm in diameter, descends from the female's ovary into a uterus where it is fertilized. Once fertilised the egg is encased in a very thin shell similar to that of birds and reptiles. This shell is just a few microns thick and disintegrates when the egg reaches the third phase of gestation. A remnant from the evolutionary, past this unusual characteristic is common amongst marsupial mammals. The gestation period for a kangaroo is approximately 30 days and varies amongst the different types of kangaroos.
Kangaroo Birth How a Kangaroo Baby is Born
As the time approaches for the young kangaroo to be born, the female kangaroo cleans out its pouch by sticking her head into her pouch, licking the inside of it clean. It then takes up a 'birthing position' by sitting on its back with its tail between its legs and the hind legs extended straight forward. It also leans the trunk of its body forward. It then licks its birth canal opening, possibly to stimulate the birth.
Joey Crawling to Pouch
Video: Kangaroo baby crawling to mother's pouch
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The young kangaroo, no larger than a jelly-bean (2 cm), and weighing less than one gram, soon emerges from the birth canal. It is born blind, hairless, with stumpy forelimb and hardly any trace of its hind legs. Even though it is still so underdeveloped, the young newborn has an excellent sense of direction, knowing which way is up and down and also an acute sense of smell. Using its tiny forelimbs in a swimming motion, the young joey crawls laboriously up its mother's fur to the pouch. This journey takes it about three minutes. The joey's journey is made entirely by itself. The mother does not assist it in any way. Once inside its mother's pouch, the joey quickly attaches itself firmly to one of four nipples in the pouch.
Photo: Kangaroo joey attached to mother's teat
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Once it has attached itself to its mother's nipple, the young joey will stay hidden for up to six and a half months. Then it will start to tentatively pop its head out of its mother's pouch and observe the world around it. About two weeks later, it will have gained enough confidence to venture out of the pouch and hop about close to its mother. However, if frightened, it will immediately jump back into the safety of the pouch. By the time it is about eight months old, the joey no longer uses its mother's pouch.
Did Young Kangaroos Bud from their Mother's Nipples?
Photo: Joey attached to nipple
Because the young joey attaches itself so firmly onto its mother's nipple and is very difficult to pull away from it, early European explorers thought that baby kangaroos just miraculously grew off the nipple in the mother's pouch. This is because they could see no apparent opening inside the pouch from which the joey could have emerged. They didn't know about the little joey's perilous journey from the birthing canal to the pouch.
Kangaroo Milk Production Two Types of Milk
Photo: Kangaroo Joey
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The female kangaroo can produce two types of milk, depending on the joey it is feeding. The milk produced in the nipple on which an embryonic joey is attached will be different from the milk produced to feed a joey that has already left the pouch and only comes back to be weaned.
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