Then there's the fate of the Tasmaniantiger and the passenger pigeon.
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A Tasmaniantiger pelt found in New Zealand has caused excitement in Australia.
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Scientists have scanned preserved Tasmaniantiger specimens to better understand the marsupial's development in the pouch.
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If not for roadkill, the Tasmanian divil would probably go the way of the Tasmaniantiger.
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The Tasmaniantiger was declared extinct in 1936 when the last known animal died in Hobart Zoo.
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The donors in this were four 100-year-old Tasmaniantiger specimens preserved in ethanol at the Museum Victoria.
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The Tasmaniantiger went extinct in 1936.
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The inserted DNA doesn't actually code for Tasmaniantiger characteristics, but is needed to switch on genes controlling bone formation.
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In the future, his films will be like watching grainy archival footage of the Tasmaniantiger: images of a lost world.
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But hybrid Tasmaniantiger-mice could someday be created, said the researchers, and DNA from creatures like woolly mammoths and neanderthals revived.
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A Tasmaniantiger pelt has been found in a drawer in a Wairarapa taxidermy museum, where it has lain for decades.
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They put three candidate species to the test -the thylacine or Tasmaniantiger, the Yangtze River dolphin, and the Xerces blue butterfly.
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Last week, Australian Museum geneticists announced they'd replicated bits of Tasmaniantiger DNA taken from a 136-year-old thylacine specimen preserved in ethanol since 1866.
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TasmanianTiger The Thylacine serves as a cautionary tale for anyone who doubts humanity's ability to annihilate species.