| himalayan black bulbuls (hypsipetes leucocephalus niggerimus) exhibit sexual dichromatism under ultraviolet light that is invisible to the human eye. | sexual dichromatism is a key proxy for the intensity of sexual selection. studies of dichromatism in birds may, however, have underestimated the intensity and complexity of sexual selection because they used museum specimens alone without taking colour-fading into account or only measured conspicuous visual traits in live animals. we investigated whether the himalayan black bulbul (hypsipetes leucocephalus nigerrimus), which is sexually monomorphic to the human eye, exhibits sexual dichromatism ... | 2017 | 28382942 |