The Black-sided Flowerpecker Dicaeum monticolum is one of 2 endemic flowerpeckers in Borneo.  It is a common montane species and can be seen easily in Mt Kinabalu and other mountain ranges.  Around Kinabalu Park Headquarters, it is often seen feeding on the ripe berries of the Pink Medinella.  When in flight, it announces itself with a series of metallic zit calls.