Tasmanian devil
Devil facial tumour disease (DFTD) is a transmissible parasitic cancer in the Tasmanian devil. Since its discovery in 1996, DFTD has spread and infected 4/5 of all Tasmanian devils and threatens them with extinction. A new DFTD tumor-type cancer was recently uncovered on 5 Tasmanian devils (DFT2), histologically different from DFT1, leading researchers to believe that the Tasmanian devil "is particularly prone to the emergence of transmissible cancers".