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Hair and average faecal cortisol levels (expressed as nanograms per gram of substrate) were positively correlated in wild-caught chipmunks. The filled circles highlight two individuals with high levels of hair cortisol but low levels of faecal cortisol. Results are presented in the text with these points included (P = 0.055) and excluded (P < 0.001). Cortisol levels were natural-log transformed.
