The colour variables from the same individual are uncorrelated.

Table shows Pearson’s correlation coefficients calculated between the traits of male and female great tits. None of these relationships differ significantly from chance, although the relationship between female yellowness and stripe blackness is close to significance. Note that as yellowness and yellow brightness are PC1 and PC2 of the yellow plumage one would expect them to be uncorrelated. Samples sizes for these relationships are 94 males and 105 females.