Nowadays we hear a lot of about a kind of creatures that so many writers have fictionalized. Vampires feed on blood. The vampire bat would be one of its analogue in the animal kingdom, but have an equal vegetarian ones?
Perhaps aphids, among others, have the answer. These tiny arthropods feed on “the blood of the plant”, the sap, devoid of erythrocytes, through its stylet, like a tusk. Do you agree?