A lot of bats.
Rosalie killed 7 people (5 men who raped her and left her for dead and 2 guards). She never drank their blood because she didn't want any part of them inside her...
Vampire bats live on blood.
There are many legends about, however are said to drink blood 3 species of bats:# Desmodus rotundus # Diaemus youngi # Diphylla ecaudata
4
2
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How many phenotypes exist for this mrthod of blood typing
2: Red and White
0, unfortunately. it wouldn't matter how much water you drank, a blood test will show that you have had alcohol, depending on how much you drank, for up to 24-48 hours later. It really depends on your motabalism.
There are such things as vampire bats. Although many bats live off of insects and fruit, there are some larger types of bats that eat small rodents and other animals. They will not, as myth goes, suck animals or humans dry of blood. One could blame Bram Stoker and later vampire enthusiasts and fear-mongerers of starting that rumor.
Larger humans always have more blood than smaller humans. They need a larger volume to feed and oxygenate their many more cells.