Citrus Swallowtail Caterpillars from South Africa

Subject: Catipillar identification
Location: Cape Town
October 14, 2016 2:13 am
Hi there. I have found a few of these on my lime tree. I was wondering what they are and what type of moth/butterfly they will become.
I live in Sunningdale, Cape Town. It’s October now and it’s the first time I have ever seen them.
When touched they produce a forked shaped protrusion from their head and secrete a clear liquid. They are still quite small and I’ve only found three so far.
Signature: Tamlyn

Citrus Swallowtail Caterpillars
Citrus Swallowtail Caterpillars

Dear Tamlyn,
These are Citrus Swallowtail Caterpillars, and there are several species that go by that common name.  We found this matching image on Alamy, but it is not identified to the species level.  
Papilio demodocus is one species called a Citrus Swallowtail, and it is pictured on BioDiversity Explorer, but there are no early instar caterpillars pictured. We also located a matching image on iSpot.

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