https://en.wikipedia.org/wiki/Devil_facial_tumor_disease https://en.wikipedia.org/wiki/Devil_facial_tumor_disease Or CTVT https://en.wikipedia.org/wiki/Canine

https://en.wikipedia.org/wiki/Devil_facial_tumor_disease https://en.wikipedia.org/wiki/Devil_facial_tumor_disease Or CTVT https://en.wikipedia.org/wiki/Canine_transmissible_venereal_tumor https://en.wikipedia.org/wiki/Canine_transmissible_venereal_... Parasitic transmissible cancers are very rare, because they generally lack the ability to adapt genetically, and get wiped out after a few thousand years, when all their accumulated mutations start to impact their survivability.