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Longitudinal telomere length dynamics (unmanipulated birds only). Correlation of telomere length within (a) males and (b) females measured in 2017 and 2018. The dotted line represents y = x. Solid lines are regression lines for males (r = .90) and females (r = .97). (c) Density plot of telomere length change (delta) within individuals between the two sampling years, with negative values showing telomere shortening. Males = black, females = white. For statistics see Table 1
