Human hair and eye color is unusually diverse in a geographic area centered on the East Baltic and covering northern and eastern Europe (Fig. 1, Fig. 2). Within this area, eyes are not only brown but also blue, gray, hazel, or green, while hair is not only black but also brown, flaxen, golden, or red (Beals & Hoijer, 1965, pp. 212–214). As one moves outward from this area, color diversity declines markedly with eyes becoming uniformly brown and hair uniformly black.

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