Despite its unpretentious name, the common jay is no ordinary insect. The butterfly possesses beautiful wings that are velvety black and iridescent green, highlighted by a dark red median stripe. Frequenting the forest fringes of Southeast Asia, the graceful adults often stop to sip from flowering plants, such as lantana.

Ranging from Southern India through the Southeast Asian mainland, Southern Japan and into the Malay Archipelago, the common jay is represented by fourteen recognized subspecies. The butterflies were scientifically described as Graphium doson in 1864 by the Austrian lepidopterists Catejan and Rudolf Felder. The genus name is an allusion to the Latin word for a stylus used to write on waxed tablets and refers to the tips of the butterfly's hind wings, which appear pointy. Common jay butterflies prefer lowland areas and often congregate on moist sand. Egg host and larval food plants of the species include cinnamon, camphor, sour apple, custard apple, and avocado.

A young common jay caterpillar is olive brown, humpbacked, and features white paired terminal appendages, which mimic antennae, on its posterior end. These anatomical structures provide protection from predation by deflecting the attention of predators away from the insect's important head region. Older common jay caterpillars transform into a bright green color. The prominent false eyes on their thoracic hump can help create the illusion of a much larger and formidable insect or animal. As with other papilionid butterflies, the larval common jay feeds in the open during the daytime and, if threatened, assumes an aggressive defensive posture. The vulnerable head is hidden and two fleshy, brightly colored osmeteria are revealed. The osmeteria can exude a strong smelling secretion chemically related to isobutyric acid that acts as a deterrent to most predators.

Common jay butterfly specimens are widely available commercially. Habitat destruction and pesticide use threaten many Indo-Pacific tropical butterfly species, including the common jay. Some populations are exploited and are diminishing in their range, even though the species as a whole appears to remain relatively abundant. The common jay, along with its lepidopteran allies, is an important indicator of environmental change and biodiversity.

Blue Wing Marking (Medium Magnification) - This reflected light image is a decreased magnification of the photomicrograph presented above. The spot of blue-green looks smaller amidst a larger field of delicate white scales.

Blue Wing Marking (Low Magnification) - The larger picture becomes clear in this low magnification image of a common jay's wing. Here the scales are multi-colored and display an iridescent quality.

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