We have hundreds of the White (Sacred) Ibis around us but haven't noticed any of these guys. There were quite a few around wherever we walked in Darwin - the white ones too.
The Straw-necked Ibis is a large waterbird with a naked black head, long downcurved black bill and yellow throat plumes. It has a glossy blue-black back, with metallic purple, green and bronze sheen, a white nape and sides of neck and white underparts. Its preference for grassland insects such as grasshoppers and locusts have earned it the name of Farmer's Friend.
The Straw-necked Ibis is found across mainland Australia.