The Blood Sucking Vampire Bat

A lot of folks have different notions about bats, some believe that bats are generally dreadful, blood thirsty creatures looking for humans to devour, for some others, solitary nocturnal animals and in some parts of Africa bats are believed to be creatures with certain 'demonic powers' (weird huh!)
The truth is, there are different bats species, most of which feed basically on insects and fruits, but some other species which belong to the group of 'Vampire bats' feed on blood, bats are all nocturnal in nature.
The most common Vampire bat is found in South America, it is usually killed by farmers because it attacks their cattle and can transmit rabies, there have also been records of vampire bats feeding on the blood of human beings while they are asleep, they bite the skin with their sharp teeth and in the process of sucking blood, secrete certain chemicals to keep the blood from clotting while they feed, without the victim even noticing.