Trichoglossus euteles Temminck, 1835.
olive-headed lorikeet or perfect lorikeet
Lesser Sundas, Timor and adjacent small islands from Adonara and Lembata East to Nila and Babar.
Not globally threatened. CITES II
According to IUCN: Least concern.
The population is suspected to be stable in the absence of evidence for any declines or substantial threats.
The head is olive-yellow (variable from which area they come, The most yellow ones come form Timor. The greenish birds are more from the east. Smalle Islands like Babber, Nila en Kisser. Gert Van Dooren Pers.comm.)
Mainly green , the abdomen are more yellowish-green. also a faint lighter-green nuchal collar.
A broad yellow band on the underside of the flight feathers.
The tail is green above and below dull yellow-green.
Undertail coverts are yellow-tinged green.
The beak and iris is orange.
The feet, cere and small area surrounding the eyes are pale grey.
Males are usualy brighter, yellower head and the abdomen are more yellowish-green.
But as mention before, there is a big difference in birds depending from which area they come. So best DNA or endoscopic sexing.
5,5 - 6 mm
I have heard of a dark (greygreen?) bird, but never have seen it, so very doubtful.
I also have seen many with yellow feathers, if it's pied or a health problem, I don't know.