Koala 1.0 Software Free Download
Rochell Estrello
Koalas typically inhabit open Eucalyptus woodland, as the leaves of these trees make up most of their diet. This eucalypt diet has low nutritional and caloric content and contains toxic compounds that deter most other mammals from feeding on it. Koalas are largely sedentary and sleep up to twenty hours a day. They are asocial animals, and bonding exists only between mothers and dependent offspring. Adult males communicate with loud bellows that intimidate rivals and attract mates. Males mark their presence with secretions from scent glands located on their chests. Being marsupials, koalas give birth to underdeveloped young that crawl into their mothers' pouches, where they stay for the first six to seven months of their lives. These young koalas, known as joeys, are fully weaned around a year old. Koalas have few natural predators and parasites, but are threatened by various pathogens, such as Chlamydiaceae bacteria and koala retrovirus.
Because of their distinctive appearance, koalas, along with kangaroos, are recognised worldwide as symbols of Australia. They were hunted by Indigenous Australians and depicted in myths and cave art for millennia. The first recorded encounter between a European and a koala was in 1798, and an image of the animal was published in 1810 by naturalist George Perry. Botanist Robert Brown wrote the first detailed scientific description of the koala in 1814, although his work remained unpublished for 180 years. Popular artist John Gould illustrated and described the koala, introducing the species to the general British public. Further details about the animal's biology were revealed in the 19th century by several English scientists. Koalas are listed as a vulnerable species by the International Union for Conservation of Nature. Among the many threats to their existence are habitat destruction caused by agriculture, urbanisation, droughts, and associated bushfires, some related to climate change. In February 2022, the koala was officially listed as endangered in the Australian Capital Territory, New South Wales, and Queensland.
Adopted by white settlers, "koala" became one of several hundred Aboriginal loan words in Australian English, where it was also commonly referred to as "native bear",[5] later "koala bear", for its supposed resemblance to a bear.[6] It is also one of several Aboriginal words that made it into International English, alongside e.g. "didgeridoo" and "kangaroo".[6] The generic name, Phascolarctos, is derived from the Greek words phaskolos "pouch" and arktos "bear". The specific name, cinereus, is Latin for "ash coloured".[7]
The koala is classified with wombats (family Vombatidae) and several extinct families (including marsupial tapirs, marsupial lions and giant wombats) in the suborder Vombatiformes within the order Diprotodontia.[10] The Vombatiformes are a sister group to a clade that includes macropods (kangaroos and wallabies) and possums.[11] The koala's lineage possibly branched off around 40 million years ago during the Eocene.[12]
P. cinereus may have emerged as a dwarf form of the giant koala (P. stirtoni), following the disappearance of several giant animals in the late Pleistocene. A 2008 study questions this hypothesis, noting that P. cinereus and P. stirtoni were sympatric during the middle to late Pleistocene, and the major difference in the morphology of their teeth.[17] The fossil record of the modern koala extends back at least to the middle Pleistocene.[18]
Other studies have found that koala populations have high levels of inbreeding and low genetic variation.[23][24] Such low genetic diversity may have been caused by declines in the population during the late Pleistocene.[25] Rivers and roads have been shown to limit gene flow and contribute to the isolation of southeast Queensland populations.[26] In April 2013, scientists from the Australian Museum and Queensland University of Technology announced they had fully sequenced the koala genome.[27]
The koala was originally classified as Least Concern on the Red List, and reassessed as Vulnerable in 2014.[1] In the Australian Capital Territory, New South Wales and Queensland, the species was listed under the EPBC Act in February 2022 as endangered by extinction.[75][76] The described population was determined in 2012 to be "a species for the purposes of the EPBC Act 1999" in Federal legislation.[77]
While urbanisation can pose a threat to koala populations, the animals can survive in urban areas provided enough trees are present.[84] Urban populations have distinct vulnerabilities: collisions with vehicles and attacks by domestic dogs.[85] Cars and dogs kill about 4,000 animals every year.[86] To reduce road deaths, government agencies have been exploring various wildlife crossing options,[87][88] such as the use of fencing to channel animals toward an underpass, in some cases adding a ledge as a walkway to an existing culvert.[89][90] Injured koalas are often taken to wildlife hospitals and rehabilitation centres.[84] In a 30-year retrospective study performed at a New South Wales koala rehabilitation centre, trauma was found to be the most frequent cause of admission, followed by symptoms of Chlamydia infection.[91]
Though koalas look fuzzy, their hair is more like the coarse wool of a sheep. They have two opposing thumbs on their hands, and both their feet and hands have rough pads and claws to grab onto branches. They have two toes, fused together, on their feet, which they use to comb their fur.
Koalas are listed as vulnerable by the International Union for the Conservation of Nature, which has named the species one of 10 animals most vulnerable to climate change. Increasing carbon dioxide in the atmosphere is decreasing the nutritional quality of eucalyptus leaves (which is already quite low) and causing longer, more intense droughts and wildfires. In response to drought, koalas are forced to stop napping and come down from the trees to find water, spending precious energy and putting them at a higher risk of predation.
Koalas lost substantial portions of their habitat in the 2019-2020 bushfire season and have been identified by the Australian government as one of 113 animals requiring urgent help. Wildlife hospitals, rescue organizations, zoos, and volunteers have stepped up to care for injured koalas, with the goal of rehabilitating and releasing them back into the wild.
The Greater Blue Mountains World Heritage Area of New South Wales is a potential refuge area for koalas and many other species, made up of over a million hectares of protected reserves. Historically, the Blue Mountains were a stronghold for koalas, but their status there today is uncertain. We do not know how many koalas occur there, what habitats they use, or the condition of their food trees. Any koalas are likely to be widely spread in low-density populations and difficult to track in challenging mountainous terrain. Researchers from the Australian conservation organization Science for Wildlife have placed GPS radio collars on some of the resident koalas, which is providing valuable information. Additionally, permits are now in place to train koala detection dogs to assist with the surveys. Given that dogs are normally not allowed into Australian national parks, this represents a major vote of support for our work.
Fieldwork on koalas in both Brisbane Valley and on St. Bees Island continues with our collaborators at the Queensland University of Technology. Their research in Brisbane Valley aims to determine how the size and shape of habitat patches affects koala ranging patterns and contributes to habitat connectivity. It is hoped that this work will lead to future land rehabilitation in the Brisbane Valley. On St. Bees Island, work continues with monitoring the local population and studying mate choice, tree use, and other aspects of koala ecology. Our Population Sustainability scientists are in the final phase of a three-year collaborative study that is examining the genetics of the koala across its entire native home range from North Queensland to Victoria. The results from this study will provide a comprehensive analysis that will assist conservation managers with the genetic management of wild koala populations, especially as they become increasingly isolated by development.
San Diego Zoo Wildlife Alliance maintains the largest koala population outside Australia and reaches a global public through exhibition, education, and research. We continue to gain key information from our breeding colony that supplies data on genetics, mate choice, vocal and scent communication, and health. The program generates funding to support research and conservation initiatives ranging from habitat mapping to studying koala biology in collaboration with our partners. There is a strong element of conservation education and outreach to the program, which has been in place for more than 30 years.
10) Although these beautiful creatures are protected by law, and not classed as an endangered species, their habitat is under threat. Sadly, around 80% of koala habitat has been lost to human homes, drought and bushfires.
Size and weight: Koalas average 27-36 in (70 to 90cm) in length and weigh anywhere from 9 to 20 lbs (4-9 kg). Females tend to be both slightly smaller and slightly less heavy than males. Southern koalas are approximately 30% larger than their northern counterparts. This size difference is most likely an adaptation to deal with colder climates in the south.
Koalas are arboreal (tree dwelling) marsupials and have a number of adaptations advantageous to tree living. Their bodies are lean with long, muscular front and hind limbs and large, sharp claws to help with gripping tree trunks, and rough skin on the bottom of its feet to provide friction good for climbing. The koala has five digits on their front paws, two of which are opposable (this would be like a human having two thumbs). This evolutionary adaptation allows the koala to grip branches as its moves from tree to tree. Its hind paws have one opposable digit with no claw, again for grip, and its second and third digits are fused into one double claw the animal uses for grooming purposes. Its fur is thicker on its rump to provide cushion when sitting on branches.
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