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Figure 1


Fig. 1. Breast feather colour. (A,B) Average reflectance spectra of nestling breast feathers for (A) great tits (N=656 spectra) and (B) blue tits (N=864). (B,C) Association between principal component standardised score coefficients for PC1 (black line) PC2 (dark grey line) and PC3 (light grey line) and wavelength for (C) great tits and (D) blue tits.