a female fox
"The vixen trotted through the snow, her red fur glowing against the white landscape as she hunted for mice near our garden fence."
A female fox.
"The vixen darted through the tall grass, her red fur blending perfectly with the autumn leaves."
The fourth reindeer of Santa Claus.
"When Rudolph and Dasher were already flying ahead, the little girl asked if Vixen was ready to join their sleigh ride yet."