The adult has brilliant red eyes, a long forked tail and green-glossed black plumage.

They are very social and flocks of them build messy suspended globular nests in tall rain forest trees where they breed, possibly only during the wet season (north-west monsoon, October–March) (observed at Kokopo, East New Britain Province, 2016).

They are not fearful of humans and their activity on the ground below, being well separated from them by altitude, but a loud noise will see them fly out in a tight formation, circle, then return to their nests.

During the early part of the 20th century, a flock (or flocks) were seen to migrate during August[2] to Dunk Island in far north Queensland, where they mate, preparing messy globular nests for their young which hang from tall trees.

[4] They are also seen in other areas of Queensland including Kuranda in the Atherton Tablelands, and Mossman Gorge.