home to the thylacine, a marsupial which resembled a fossa or some say a wild dog. Known colloquially as the Tasmanian tiger for the distinctive striping across its back, it became extinct in mainland Australia much earlier because of competition by the dingo, introduced in prehistoric times. Owing to persecution by farmers, government-funded bounty hunters and, in the final years, collectors for overseas museums, it appears to have been exterminated in Tasmania. The Tasmanian devil became the largest carnivorous marsupial in the world following the extinction of the thylacine in 1936, and is now found in the wild only in Tasmania. Tasmania was one of the last regions of Australia to be introduced to domesticated dogs. Dogs were brought from Britain in 1803 for hunting kangaroos and emus. This introduction completely transformed Aboriginal society, as it helped them to successfully compete with European hunters, and was more important than the introduction of guns for the Aboriginal people. Tasmania is a hotspot for giant habitat trees and the large animal species that occupy them, notably the endangered Tasmanian wedge-tailed eagle (Aquila audax fleayi), the Tasmanian masked owl (Tyto novaehollandiae castanops), the Tasmanian giant freshwater crayfish (Astacopsis gouldi), the yellow wattlebird (Anthochaera paradoxa), the green rosella (Platycercus caledonicus) and others. Tasmania is also home to the world's only three migratory parrots, the critically endangered Orange-bellied parrot (Neophema chrysogaster), the Blue-winged parrot (Neophema chrysostoma), and the fastest parrot in the world, the swift parrot (Lathamus discolor). Tasmania has 12 endemic species of bird in total. Conservation Like the rest of Australia, Tasmania suffers from an endangered species problem. In particular, many important Tasmanian subspecies and world-significant species of animal are classified as at risk in some way. A famous example is the Tasmanian devil, which is endangered due to devil facial tumour disease. Some species have already gone extinct, primarily due to human interference, such as in the case of the thylacine or the Tasmanian emu. In Tasmania, there are about 90 endangered, vulnerable, or threatened vertebrate species classified by the state or Commonwealth governments. Because of a reliance on roads and private vehicle transport, and a high concentration of animal populations divided by this development, Tasmania has the worst (per kilometre) roadkill rate in the world, with 32 animals killed per hour and at least 300,000 per year. Protected areas of Tasmania cover 21% of the island's land area in the form