When did the Tasmanian tiger first become endangered?

The Tasmanian tiger, a carnivorous marsupial (dasyurid), more correctly known as the Thylacine was a native animal of Australia. It was never endangered, as the various conservation status levels were not in force before it became extinct. It was moved to "extinct" status as a result of being hunted as a possible threat to livestock in Tasmania following European settlement. The last known Tasmanian Tiger died in the Hobart Zoo in 1936, and there have been no confirmed sightings since then.