What is the primary distinguishing feature of satin fur compared to normal fur?

Satin fur is characterized by its unique sheen, which results from a smaller, transparent hair shaft. This finer texture allows light to reflect off the fur in a way that gives it a distinctive glossy appearance, setting it apart from normal fur. The hue and sheen of satin fur are not just aesthetic; they can also indicate health and vigor in a rabbit.

In contrast, the other options don't accurately describe the main feature of satin fur. For instance, satin fur is not specifically known for having a larger hair shaft or being coarser than normal fur, nor is its primary distinguishing quality related to being softer. Understanding the significance of the hair shaft's structure helps in recognizing the exquisite nature of satin fur, which is valued highly in show settings.