Bats are part of a small group of animals that have become victims of bad popular image due to the stories and pictures that have been spread about them. The truth is that most bats feed on fruits and insects, being only three species of bats the only ones that feed on blood. Here’s how a group of vampire bats walk over the body of a pig and examine it with the heat sensors located in their faces, allowing them to find the right spot to draw blood. They can drink half or their body weight in blood causing almost no pain in their victims.