Have you ever wondered what kind of evolutionary path led blood-sucking critters to their current status quo? Was it one mutation that caused these parasites to crave blood? Imagine if your baby begged for blood instead to milk! Ew. Maybe it was some sort of mass mutation that spurred the creation of a shady organization where members vow not to kill their victims. Again, ew. But if the members of the organization reproduce with one another, they can create a new species over time. Maybe this is how vampires will arise.
