At least some scientists think omicron evolved in animal rather than human hosts. COVID-19 has spread among many types of animals, but the original didn't spread readily among rodents. But omicron has some mutations that seem to help the virus infect rodents.
Some experts suggest Omicron variant may have evolved in an animal host
Some experts speculate the Omicron variant evolved not in an immunocompromised person, as widely believed, but in another animal species.www.statnews.com
I heard on NPR today a story about snow leopards in the wild in Asia. they are already threatened thanks to human encroachment, but they are facing another threat. They appear to be extremely vulnerable to COVID. 4 in zoos around the world have already died from it and they can get it from animals they kill.
Interesting about rodents and omicron. That's too close to the black death scenario for comfort.