Why Some Viruses Vanish:
[bbc.com][BBC%20Features%20Newsletter]-2020September25-[Future%7c+Image]
Interesting! Wonder what happened to other species before we appeared on the scene? How many species were just extinguished--before we knew about them? I know of rinderpest--it nearly wiped out several vulnerable species of "hoof stock'' in Africa...and rabies nearly decimated the African wild dog.
We may never know the answer.