Fur appears as a small, dark oval with light streaks.
Where Found
Fur is received when dropbears die or are killed. An efficient way of getting fur is to burn a tree with a dropbear on it using an ember. The dropbear will burn and drop leather and fur.
Fur is a common term for the thick hair covering many types of animals (mostly mammals). It's also used to refer to said hairs after having been removed from the animal while still attached to its hide.