Earlier quoted context omitted.
Well... look up things like “cow eating chicken” or “deer eating bird” on YouTube. Not saying it’s common, but “never” is perhaps too strong a word. And of course I really meant it in a larger sense, not the direct ruminant/person relationship.
I've seen a cow eating the carcass of another cow before. Kind of fascinating and morbid at the same time.
The circle of life is far more complicated than herbivores/carnivores and many animals will happily grab a meaty snack if opportunity arises.