This 'Tasmanian tiger' was in fact a marsupial, one of the largest carnivores of its kind. It had a jaw that could extend to 80 degrees. Many existed in captivity in zoos as far afield as London and Washington.
Due to hunting of wild thylacines, the last is believed to have died in Beaumaris Zoo, Tasmania in 1936.
Leviathan features a character who owns a Tasmanian Tiger as a pet called Tazz.