While the previous 12 vampires have all been documented by scientists, this one's different. The chupacabra (Spanish for "goat sucker") is a mythical creature like Bigfoot, and although alleged sightings are common, its existence is unproven. But that hasn't slowed speculation — as with Bigfoot, the chupacabra's mystique only adds fuel to its fame.
The legend dates back decades, but it went viral in the 1990s after hundreds of dead farm animals were found in Puerto Rico, drained of their blood. Chupacabra tales soon spread around the world, to Mexico, the U.S. and even Russia. Most captured chupacabras turn out to be mangy dogs or coyotes (pictured), but some believers say the real thing may be an alien pet left behind by space travelers, or even an alien-animal hybrid made by NASA.
For more about chupacabras and other creatures of questionable existence, check out the video and related links below: