One of the most frightening and fearful of Jamaican duppies (ghosts) is the Rollin Calf (Roaring Calf). The Rollin Calf is described as having red blazing eyes and taking the form of various animals such as a dog, hog, goat, horse or the most common of all a bull or the most dangerous being that of a black cat. It is also said to have the power to grow in size from small animals (cats or dogs) to large animals (horse or bull) whilst also appearing as a headless goat. They usually have a piece of chain attached to their necks, whose rattle is said to instill paralyzing fear to any who hear it. The Rollin Calf can often appear to be seen lying in the middle or roads, being a deliberate obstruction, many who claim to have seen this will often take another route to reach their destination, no matter how long or out of the way it may be. One way to get rid of the Rollin Calf is to flog him with the left hand; it is said to be afraid of a tarred whip. Others also claim that the Rollin Calf is fearful of the moon.
It is believed that Rollin Calves are devil spirits in the form of animals who roam at nights and settle at the root of cotton trees, bamboos and caves as duppies during the day; visible only to those who can see spirits. Historically, the Rollin calf emerges at nights mainly during crop time on sugar estates because of its fondness for molasses.
The dreaded Rollin Calf has brewed fear in the minds of many who claim to have seen it as well as those who have heard stories of its sightings. It represents an important aspect of Jamaicas folklore that has been incorporated into songs and poems.