This is a juvenile Black-sided flowerpecker. As an adult, the male is glossy dark blue on the back and has a bright red bib. The adult female retains much of the olive-yellow coloration but gains gray on the head and a lighter throat. The species is only found in mountainous regions above 1,000 meters in Borneo. It feeds mainly on berries, a favorite being mistletoe, but supplements with seeds, nectar and various invertebrates. It builds a nest of moss, camouflaged on the outside with lichens and lined with fibers from tree ferns.