A Chupacabra' is a legendary cryptid rumored to inhabit parts of the Americas, with the first sightings reported in Puerto Rico. The name comes from the animal's reported habit of attacking and drinking the blood of livestock, especially goats.
In the episode The End, a chupacabra is terrorizing the area around Cormac McCarthy's ranch. The creature manages to kill Miguel, an employee of McCormack. After Mike Tyson and McCarthy dispatch the creature, it is revealed to actually be John Updike.