They do suffer from all sorts parasites and diseases, that’s why they live less than pets, and meat of wild animals is a huge health hazard unless cooked extremely thoroughly.
Then there’s adaptation. If all you can eat contains salmonella, the species will adapt to surviving it. However it wastes resources that could be put into more advantageous perks, like an advanced simian brain that can only thrive with safe and plentiful food.
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