Did you know there are two different types of chupacabras? Or that these bloodsucking monsters only starting popping up 25 years ago? Sightings of el chupacabras, the “goatsucker,” began in Puerto Rico in 1994 for a very real reason—the unexplained deaths of many farm animals. Dr. Zarka looks at why humans are afraid of a creature that doesn’t real prey on humans, and traces the journey of the chupacabras from island monster to popular folk legend.