In south Texas, its frightening name resurfaces in the news every few months — especially after another neighborhood pet or farm animal mysteriously dies. "El Chupacabra," they say, "is back." Parents are cautious, warning their children to stay inside at night or risk a face-to-fang encounter with the chupacabra — a red-eyed, spiky-haired, blood-sucking creature with a green-blue tint to its hide.The chupacabra haunts the minds of the residents in La Frontera, the U.S.-Mexico borderlands. Here, an amalgamation of cultures blend, represented by Gulf shrimp tacos, polka-inspired Tejano music, and young, white girls who also hold quinceneras, the Mexican teen rite-of-passage celebration.Amid this mostly peaceful cultural mishmash, the chupacabra — translates to goat-sucker — replaces the boogeyman. Rumored to be originally of Puerto Rican folklore, the chupacabra and its reign spread to Central America in the '80s and '90s, and has moved northward through Mexico and Texas, where it has quickly been embraced and has lately been portrayed in artwork and film. Like other mythic monsters, the chupacabra has its believers — just ask www.elchupacabra.com Webmaster and science-fiction buff Dave Pettis. "I just believe there can be something out there like that," said Pettis, who lives in Northern California. "I don't think every animal in the world has been classified." Pettis said he gets lots of e-mails from people. Some are curious about the creature, while others want to submit their own sightings. "Some people think it's some [lab] experiment that escaped, but other people think it's some animal that's been around for a long time, like in South America. The clearing of the rain forests has made it come out," he said.