Cuélebre (Asturias, Spain)
Cuélebre (Asturian) or Culebre (Cantabrian), is a giant winged serpent dragon that lives in a cave, guards treasure and keeps prisoners. Although they are immortal, the cuélebre age, and their scales become thick and impenetrable, and bat wings grow in their bodies. They must eventually flee Asturias and fly to the Mar Cuajada, a paradise located beyond the sea.
They do not usually move, but when they do it, it is in order to eat cattle and people. One could kill the cuélebre by giving them a red-hot stone or a bread full of pins to consume. Its spit it is said to turn into a magic stone, which heals many diseases.