how long does a red kangaroo live for
Kangaroo 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 hindlegs are mere stumps; it instead uses its more developed forelegs to climb its way through the thick fur on its mother's abdomen into the pouch, which takes about three to five minutes. Once in the pouch, it fastens onto one of the 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 rapidly. After about 190 days, the baby (joey) is sufficiently large and developed to make its full emergence out of the pouch, after sticking its head out for a few weeks until it eventually feels safe enough to fully emerge. From then on, it spends increasing time in the outside world and eventually, after about 235 days, it leaves the pouch for the last time.[46] The lifespan of kangaroos averages at six years in the wild[47] to in excess of 20 years in captivity, varying by species.[48] Most individuals, however, do not reach maturity in the wild.[49][50]
Indigenous Australians Indigenous Australians are the Aboriginal and Torres Strait Islander people of Australia, descended from groups that existed in Australia and surrounding islands prior to British colonisation. The time of arrival of the first Indigenous Australians is a matter of debate among researchers. The earliest definitely human remains found in Australia are those of Mungo Man LM3 and Mungo Lady, which have been dated to around 50,000 years BP.[2] Recent archaeological evidence from the analysis of charcoal and artifacts revealing human use has pushed this date back further to around 65,000 B.P. [3][4] Luminescence dating has suggested habitation in Arnhem Land as far back as 60,000 years BP.[5] Genetic research has inferred a date of habitation as early as 80,000 years BP. Other estimates have ranged up to 100,000 years [6] and 125,000 years ago.[7]