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The black-naped monarch (Hypothymis azurea) is a slim and agile passerine bird belonging to the family of monarch flycatchers. They are sexually dimorphic: males have a distinctive black patch on the back of the head and a narrow black half collar ("necklace") while females are duller and lack the black markings. Their call is similar to that of the Asian paradise flycatcher. In tropical forest habitats, pairs may join mixed-species foraging flocks. Populations differ slightly in size and plumage colour.Photograph: JJ Harrison
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