What are the long hairs of a rabbit's coat known as?

The long hairs of a rabbit's coat are known as guard hairs. These hairs serve several functions, primarily providing protection for the underlying layers of fur. Guard hairs are coarser and longer than other types of hair on a rabbit's body, creating a protective barrier against environmental factors such as moisture and abrasion. This layer also contributes to the aesthetic appearance of the rabbit's coat, helping to define its color and pattern.

In contrast, the other terms refer to different components of a rabbit's fur. The undercoat consists of shorter, softer hairs that provide insulation, while fur hairs and down hairs do not specifically denote the long protective hairs characteristic of a rabbit’s coat. Thus, guard hairs are essential for both protection and maintaining the overall health of a rabbit's fur.