>  Tourists who take selfies with wild mountain gorillas could put the
>  primates at risk of developing Covid-19, according to new research.

Funny you should mention that.  Today's NY Times has a piece on the gorillas
at the San Diego Safari Park, the open air annex to the SD Zoo.

  The noises of nature sometimes carry broader meanings. The howl of a wolf
  signifies that wildness endures. The gronk of Canada geese moving south
  overhead reminds Americans to brace for winter. The sound of a coughing
  gorilla signals that Covid-19 is an even bigger problem than we
  thought. ...

https://www.nytimes.com/2021/02/19/opinion/covid-symptoms-gorillas.html
https://www.nytimes.com/2021/01/11/us/gorillas-coronavirus-san-diego.html