This beautiful sunbird Aethopyga temminckii is generally considered as a bird of the hills and mountains of Borneo. On occasions I have also seen it in the lowland forest (300m) of Tabin Wildlife Reserve. The male bird announces itself with a continual cheet cheet usually from the tree canopy. Its red tail distinguishes itself from the closely similar Javan Sunbird A. mystacalis (endemic to Java) which has a purple tail.