caterpillar
Location: Brisbane, Australia
February 8, 2012 8:04 pm
Hi,
There are a couple of these guys eating my kaffir lime tree – what sort of caterpillar is he? What sort of butterfly would he become???
Signature: Katie

Orchard Swallowtail Caterpillar
Dear KAtie,
Your caterpillar is that of the Orchard Swallowtail, Papilio aegeus, a common species in Australia. The adult Orchard Swallowtail is a lovely butterfly, though lacking namesake tails on the wings found in so many members of the genus. The Caterpillars feed on the leaves of citrus. The Brisbane Insect website has nice images of the entire life cycle of the Orchard Swallowtail.
Thanks! one of the is already pupa-ing up. Can’t wait to see them as butterflies 
Please send photos of the chrysalis and butterfly if possible.
Caterpillar
Location: Australia QLD Redcliffe 4020
December 9, 2011 10:18 pm
Hey guys.
Found this Caterpillar today eating my Orange Tree leaves. Like to know what this is and if it’s a thread to the tree or not.
Michael
Signature: michael from australia redcliffe QLD

Orchard Swallowtail Caterpillar
Dear Michael,
This spectacular caterpillar is that of an Orchard Swallowtail, Papilio aegeus, and we confirmed that identification on the Brisbane Insect website. As you indicated, the caterpillar eats the foliage of orange and other citrus trees, however, the loss of some leaves will not harm the tree appreciably. The red horns at the front of your caterpillar is a scent organ known as the osmeterium. It is normally hidden, but when the caterpillar feels threatened by a predator, the osmeterium is displayed along with an odor that is described as disagreeable.