I did read that. Right after the bit I quoted: > Calicivirus, 1080 poison, agricultural chemicals, and habitat fragmentation combined with a retrovirus were ot

I did read that. Right after the bit I quoted: > Calicivirus, 1080 poison, agricultural chemicals, and habitat fragmentation combined with a retrovirus were other proposed causes. Environmental toxins had also been suspected. But the source for that is also kinda useless... someone with the last name Owen wrote a book in 2005, great. I'm used to footnotes containing quotes from the material they reference, and even when it links to a source, since link rot is out of their scope, that doesn't really help. > suggests that the cancer is spreads though allograft (i.e. a form of direct transfer of the cancer from one individual to another) Yes, but why is that a recent disease? 1996 is super recent. > It also reports that "The devils have, in a way, fought back the extinction by developing the gene that is immune to face tumors" - a positive development in the long run. The long run is the last 100k years, IMO. When I think about cancer historically, I am interested in that timeframe, not starting with 1996. I wrote this reply 21 minutes after your comment, but apparently I was throttled so I had to keep the tab open to post it much later. I'm done here, good luck and bye everybody.