answers: in the 20th century
context: had 110 plains zebras in 10 locations for selective breeding, and individuals began to show a reduction in stripes and a browning of the fur, owing to the success of the project. As of 2016, there were 6 rau quaggas that had been produced through selective mating. These animals appear identical to the quagga but likely have a differing genetic code. The Thylacine is native to continental Australia, Tasmania and New Guinea. It is believed to have become extinct in the 20th century. The thylacine had become extremely rare or extinct on the Australian mainland before British settlement of the </s> of the Queensland tiger. The fundamental difference between the two cases, however, is that the last Tasmanian tiger in captivity died in 1936, and the species was not officially declared as extinct until 1986. This makes the prospect of species survival of the thylacine more likely than that of "Thylacoleo". In his 1965 revision of the book "Furred Animals of Australia", Ellis Troughton proposed that the Queensland tiger was merely a mainland variant of the thylacine. Similar ideas have been promoted since then, most notably by Victor Albert and Peter Chapple - these theories and variants of them have been </s> settled districts' and Flinders Ranges) and New South Wales (Blue Mountains) exist from as late as the 1830s, from both indigenous and European sources. The absolute extinction is attributed to competition from Aboriginal Australians and invasive dingoes. A study proposes that the arrival of the dingoes may have led to the extinctions of the Tasmanian devil, the thylacine, and the Tasmanian nativehen in mainland Australia because the dingo might have competed with the thylacine and devil in preying on the nativehen. However, the study also proposes that an increase in the human population that gathered pace around 4,000 years ago
question: when did the last tasmanian tiger go extinct