Fur was the name for the body hair of non-Human mammals. One
example of a creature with fur was the Tarcassian razor beast,
which was a winged, furry animal noted for the spines on its
wings and its loping way of locomotion. When she was a child,
Guinan had an imaginary one as a pet. In her mind it had dark
brown fur, gold eyes, and enormous wings that let it fly so fast
no one but her could see it. (TNG: "Imaginary Friend") When
discussing tribbles in 2268, Spock noted to Dr.McCoy that while
they were "nice, soft, and furry and they make a pleasant
sound", a violin covered in ermine would be the same, and he
would "see no advantage in having one." (TOS: "The Trouble with
Tribbles") One of the youths living at the settlement on Gaia,
Gabriel, told Worf that he wanted to join the "Klingons" so that
he could ride a wild torga, hunt, and trade furs for the things
he needed, as the other "Klingons" did. (DS9: "Children of
Time")