AUTHOR CONTRIBUTIONS
ANGK conceived the study and designed it with AM and AB; ANGK and ECN performed fieldwork with the help of AM; ECN, DP, MM and BOO performed molecular labwork; ECN performed the spectrophotometry; MM and BOO scored plumage traits; AB assembled the reference genome and performed all bioinformatics; AB, ECN and ANGK analysed data; and ANGK wrote the manuscript with contributions from all authors.