Okay. So. You know how some people want to finish exterminating all large predatory mammals so they have less competition for deer and so they don't occasionally lose livestock? And you know how native deer species in North America have been hit increasingly hard with Chronic Wasting Disease (CWD) in the past couple of decades due to overpopulation thanks to the eradication of large predatory mammals that normally keep them in check?
We already have evidence that reintroducing predatory mammals to their native ranges not only knocks deer populations back to a healthier level, and now we've discovered that apparently the digestive systems of cougars and bobcats are lethal to CWD prions. Prions are among the most difficult pathogens* to eliminate; you have to heat them up to about 1,800 degrees F in order to thoroughly destroy them. And prion diseases like CWD are almost universally fatal.
So to find that these wild cats can safely eat CWD-infected animals AND significantly reduce the chances that the prions will be spread to other deer is a pretty big deal, especially since some other animals like coyotes and crows do pass prions undamaged through their digestive systems. And it's just one more example of why an ecosystem needs all of the species that have evolved in it over thousands of years, not just those are convenient for humans to have around. The spread of CWD is directly related to the overpopulation of deer, and it's likely that continuing to reintroduce large predatory mammals to their native range will help quell this awful prion disease.