Roe deer are called "roe deer" because the term "roe" actually refers to a species of small to medium-sized deer in the Capreolus genus. The name "roe" comes from the Old English word "ra," which means a small deer or a roebuck. The word "roe" has been used for these deer for many centuries, and it's a specific term that distinguishes them from other types of deer, such as red deer or fallow deer. So, the name "roe deer" is simply a way to describe and identify this particular species of deer in the Capreolus genus.
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