Because depending on the species of culture their stomach acid is 10-100 times stronger than ours.
In our stomach, our stomach acids kills most of the bacteria and breaks down a lot of the things that we eat. But some things can still get through. Meaning some parasites with thick walls/casings on their eggs or bacteria with thick cell walls can get through and make you sick.
For a vulture, pretty much anything that enters its stomach is obliterated down to its DNA, and then the dna is broken apart, because they just have a much stronger stomach acid.
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