The Purple-naped Sunbird Hypogramma hypogrammicum is one of the more common sunbirds in Borneo.  It feeds on small insects and is also partial to pollen of various flowers in the lowland forest. It utters a loud tsip while moving from blossom to blossom, with an occasional series of notes.  It is easy to miss the metallic purple band on its nape (absent in females) if you are looking up at the bird.