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Cover A pale colored gray wolf from British Columbia, Canada, exemplifies the phenotypic variation in North American canids. Despite their high mobility, wolf populations are locally adapted and are varied in both their morphology and coloration. Light colored gray wolves are much more common at higher latitudes than black wolves, with almost all gray wolves having pale coloration in the high Arctic. However, in forested areas (as in this photo) at the southern extent of their North American distribution, black and light colored coats are similar in frequency. (Photo: Marco Musiani © 2007. [For details, see vonHoldt et al., pp. 1294–1305.])