This venomous reptile is the only species of snake in the state with a segmented rattle at the end of its tail. It has brown or black chevron-shaped markings down its back - a pattern the resolution denotes as "reminiscent of West Virginia's fauna and flora". The background color may vary from bright yellow to a dull gray, but entirely black specimens have been recorded. Rattlesnakes rarely exceed six feet in length. Usually a docile snake, rattlers usually occur in remote, rocky, mountainous sections of West Virginia.
The resolution also named Megalonyx Jeffersonii, or Jefferson's Ground Sloth, as the state's official fossil. This giant prehistoric ground sloth was discovered in Monroe County in the 18th century and named after the third president.