Chupacabra is a supernatural creature gifted with many features. According to folk tales, Chupacabras can change colors like a chamaleon. He can also fly or leap over twenty feet in a single bound according to some witnesses.
More suprisingly, Chupacabra exhibits intelligent behavior and possesses some rudimentary skill of becoming undetectable.
These powers have presumably helped him to escape captivity and avoid instances of close contact with people.