The authors apologise for a typographical error on pages 216–217 in the sub-section ‘PLUMAGE’ of the ‘RESULTS’ section of the article. The original published version of the article contained the following incorrect sentence:

Supporting Information, Fig. S5 shows that all nuptially plumaged males sampled in the PZI have the M. l. assimilis phenotype of darker blue on the dorsal surface, which does not contrast between the ear coverts and crown as in M. l. lamberti.

This sentence has now been corrected to read as follows:

Supporting Information, Fig. S5 shows that all nuptially plumaged males sampled in the PZI have the M. l. assimilis phenotype of darker blue on the dorsal surface, which results in contrast between the ear coverts and crown unlike the more concolorous pattern of crown and ear coverts in M. l. lamberti.