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Apr 24, 2023 at 22:44 vote accept James Grossmann
Apr 16, 2023 at 3:33 comment added elemtilas Presumably. S. vampiris has evolved a digestive system that can handle a blood diet. Also a diet rich in iron and salt. I would consider those as givens, since the OP recognises their impact.
Apr 15, 2023 at 15:04 comment added AlexP Blood contains an awful lot of iron, a awful lot salt, a lot of protein, precious little carbohydrates, and very little fat. The size of the purely haematophagous animal is limited by the amount of fat in its diet, even assuming that it somehow manages to deal with the iron poisoning, the sky-high sodium level, and the protein poisoning. This is the problem which must be addressed.
Apr 15, 2023 at 9:37 comment added Daron There is still the concern that a large animal cannot effectively digest an all-blood diet.
Apr 15, 2023 at 7:39 history answered lupe CC BY-SA 4.0