Then there are the famous vampire bats.There are three species of vampire bats,all in Central and South America.And yes,they do feed on blood,mostly that of farm animals.A vampire bat needs about two tablespoons of blood a day.
Even vampire bats have their uses.Their saliva contains a substance that prevents blood from clotting.Doctors use it to make a medicine for heart attack and stroke patients.The name of this medicine is Draculin.
Aquariums