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So how large of an organism can a diet of strictly of blood support? In a modern Earth setting it might be a bit hard for a large hematophagic organism to find a suitable group of prey that it won't drain completely, so what if it had access to megafauna the size of dinosaurs?

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  • $\begingroup$ Please proof read your question. It is unclear if you are asking about the size of the eater or of the eaten. $\endgroup$
    – L.Dutch
    Commented Apr 1, 2020 at 7:34

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given the right conditions, something like an allosaurus-vampire could shepherd dinosaurs or other megafauna and feed off them repetitively without killing them. A large straight-up predator would need to either kill and consume its prey or else feed repetitively and leave them alive. Perhaps it lives like a sheep dog, protecting its megafauna from other predators and mega-vampires. The prey-animals might not even resist feeding.

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