Cover. Unlike many other mammals, in yellow-pine chipmunks (Tamias amoenus) females are larger than males. DNA-based parentage analysis reveals that variation in male and female reproductive success is equal and that the opportunity for sexual selection is low in male chipmunks relative to other mammals with male-biased sexual size dimorphism. See Schulte-Hostedde et al., pp. 351-356. Photo by J. S. Millar.
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