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Our ancestors were primarily leaf eaters, so moving to grass wouldn’t be that unusual. But let’s picture the first proto-human that decided to go for the carcass of another animal, either killed by a predator or by fire or lightning. That would have been an event.
I’m pretty sure most primates are omnivores so they’d have been hunting as well just more in an opportunistic way
If we are to go back far enough, we are bound to find an ancestor mostly herbivore. On that level, going for the scenario I mentioned would have been some event.