The single most distinguishing feature of alligator leather is the umbilical scar. The alligator is the only crocodilian that has this feature. Designers will often put this section of the leather prominently on their products to make the authenticity of the leather evident. As many as three may be used in making a purse. The umbilical scar is an elongated star shape with a webbing pattern in it. Finding this mark on leather identifies it as genuine alligator. The belly scales of the alligator and crocodile are smooth and pliable. The alligator has a slightly less even pattern than the crocodile with some irregularities appearing in the scales.