A female bighorn is a female sheep of the species Ovis canadensis, which is native to North America. The term 'EWE' is used to refer to a female bighorn, as it is a three-letter word that is commonly used to describe female sheep. Female bighorns are typically larger than males and have horns that are curved and pointed. They are herbivores and live in mountainous regions, where they graze on grasses, shrubs, and other vegetation.