"Any fool can fling arrows off a parapet at an attacking army, but to truly master the bow requires a lifetime of dedication."
Archers are skilled hunters and scouts, as well as being masters with their chosen weapon, the bow. Their skills represent their ability to survive in the wild, track down their foes, and their self-sufficiency in building and repairing the tools of their trade. Achieving real skill in archery takes such a lengthy commitment that master archers are generally reluctant to teach those who have already started down a different path.
Tall, agile races with good eyesight make the best archers, notably Elves and Centaurs. Clumsy, bulky or non-humanoid races such as Ogres and Griffons will not fare so well. The Prime Requisite of archers is dexterity.