Coagulation, the reaction into a broken blood vessel, the conversion of blood from a liquid to some semisolid gel to stop bleeding Ticks, leeches, feminine mosquitoes, vampire bats, and an assortment of other normal creatures do eat the blood of other animals, but only bats are connected to vampires. https://allkindsofsocial.com/story5260834/a-secret-weapon-for-blood-castle-mu-online