The name comes from the animal's reported habit of attacking and drinking the blood of livestock, especially goats.
Stories suggesting Chupacabra activity can be found in newspapers dating back to the 1950s. In fact, the first reported case in North America was in Arizona sometime around 1956. Although incidents have been reported in Arizona, Oregon, Michigan, Illinois, New Jersey, New Mexico, Florida, and parts of Chile, Brazil and Mexico, the majority of activity has occurred in Puerto Rico. A rash of attacks plagued various regions of Puerto Rico in 1995. In Canovanas alone, several hundred livestock f atalities were attributed to the Chupacabra.http://www.howstuffworks.com/science-vs-myth/strange-creatures/chupacabra.htm