Olive backed Sunbird Singing - Exhibiting Territorial Behaviour

This male olive-backed sunbird, in full breeding plumage, was only about 5 m away from me on a new frond of a Macarthur Palm tree. It stayed there singing for a few minutes, perhaps because I had intruded into its territory. In the 2nd and 3rd segments of this video, you can hear another sunbird singing in the background. This could be its mate.