Back-to-back mating pair of Priam’s Birdwing Butterflies (female above, male below).
The Priam’s Birdwing or Common Green Birdwing (Ornithoptera priamus), too Cape York Birdwing and Northern Birdwing, is a widespread species of birdwing butterfly found in the central and south Moluccas, New Guinea, Bismarck Archipelago, Solomon Islands, and northeast Australia.
Ornithoptera priamus is a variable species. There have been as many as 99 subspecies described with many more named variants and forms described for both sexes. As in other species of the genus Ornithoptera, the females are larger and less vividly colored than the males, them being mainly blackish or dark brown with patterns in pale brown, yellow or white. In males, iridescent areas of the wing are typically green, although some subspecies endemic to island groups east of New Guinea have blue males.
Ornithoptera priasmus has wingspan about 15 – 21 cm.