Orchard Swallowtail (Papilio aegeus) lives in tropical rainforest across Australia and New Guinea. It feeds on citrus leaves only.
Fascinating facts about the Orchard Swallowtail
- A single female orchard swallowtail can span 140 mm (5.5 in) from wingtip to wingtip, while a male reaches about 120 mm (4.7 in), roughly the length of a school ruler laid flat. That makes it the largest butterfly commonly found in Brisbane, where many citrus trees grow.
- After about four weeks of nonstop feeding, a green orchard swallowtail caterpillar can stretch to 60 mm (2.4 in), nearly the length of a standard pencil, before it spins a silk-lined cradle and transforms. That month-long growth window is critical; the larva must amass enough energy to survive the vulnerable pupal stage that may last from one to six months, depending on the season.
- Papilio aegeus inhabits every Australian state except Tasmania, with especially dense colonies in Queensland and even a seasonal push into Victoria during summer. Its reach stretches to Papua New Guinea and Thursday Island, and distinct subspecies pepper islands across the Banda and Bismarck seas.
- Orchard swallowtail caterpillars are notorious garden guests because they chew on citrus leaves, sometimes earning the label of pest in suburban yards. Their menu includes a long list of native Rutaceae such as Boronia, Zieria and Flindersia, plus introduced favorites like Murraya and Choisya.
- A female drops a creamy-white egg just half a millimetre across. Each tiny sphere sits alone, and after roughly one week the caterpillar hatches.
Sources
Every fact above was checked against these pages, and kept only where one of them states it.
At a glance
RangeAustralia and New Guinea
HabitatTropical rainforest
DietCitrus leaves only
About the Orchard Swallowtail
As the Orchard Swallowtail dances through the sun-dappled orchard, its iridescent wings beat with a mesmerizing rhythm, casting shimmering shadows on the ripe fruit below. With an effortless glide, it navigates the labyrinthine branches, its delicate tail streaming behind like a silken banner, as it seeks out the sweet nectar that sustains it. In this fleeting, whirling world of light and color, the Orchard Swallowtail is a master of elegance, its very existence a testament to the beauty and wonder that still awaits us in the unassuming corners of our natural world.
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