The Sheep is a small white creature with black ears, face and feet. It has a single LEGO stud on its back. Sheep are very skittish and will run away from any approaching character until they reach a certain distance, then turn back and watch carefully. When ridden, if they are idle, they will cycle between eating grass, and trying to buck their rider off.
There are currently no sheep in the standard LEGO system that resemble this sheep. There are some in DUPLO, however.