Crotalus unicolor is a venomous pitviper species found only on the Caribbean island of Aruba, off the coast of Venezuela. It is sometimes still classified as a subspecies of Crotalus durissus. Moderately sized, this species attains an adult length of approximately 90 cm, and weighs about one kilogram. It is light brown, tan, or almost pink in color, reflecting the soil color of its native habitat, with darker brown diamond-shaped markings, but colors may vary from white to apricot, or brown to slate. The markings are sometimes nearly invisible, or only visible in a narrow stripe down the middle of the back. (Source: Wikipedia.org, CC BY-SA)