Covid has been circulating in animals for millions if not billions of years. Doesn’t mean anything to us humans unless the virus can make the jump between species, which is astronomically rare or we would have had covid like pandemics multiple times every year due to all the animal virus in the world.
No, I'm saying the cross-species variant of SAR-CoV-2 (the variant that jumped from animals-to-humans) is infecting both humans and animals simultaneously. So even if we vaccinate all humans, we would need to vaccinate (or genocide) the bat, pangolin, civets, deer, dog, cat population that can be animal hosts to SAR-CoV-2, meaning "herd immunity" is impossible because SAR-CoV-2 can hide amongst animals and SAR-CoV-2 can still mutate in the animal population. For example, we don't know if Omnicron mutated among animals or among humans.
We are only able to eradicated like two viruses in human history (e.g. Smallpox) and only because Smallpox can infect only humans (and not animals) and we mass-vaccinated before it can mutate too much. With COVID, we are vaccinating at an snail's pace with human population, and there is already a dozen variants emerging...