Table 2.

Eigenvectors of morphological variables and the first two components (PC1 and PC2) obtained in the principal component analysis. (The PC1 explains 43.3% of the variation and PC2 an additional 15.3%.)

variable	PC1	PC2
tarsus length	−0.08447	0.94860
wing length	0.43980	0.30598
forehead patch area	0.49924	−0.4860
% grey on back and head	−0.40681	0.04694
white in tail feathers	−0.45132	0.04092
white in wing patch	0.42546	0.01734