Mexican Swallowtail Caterpillar

What’s That Bug?
September 8, 2009
in the back yard under a ovacado tree
not sure
from jalisco mexico

Swallowtail Caterpillar
Swallowtail Caterpillar

Dear not sure,
This is a Swallowtail Butterfly Caterpillar “in the ‘ Pyrrhosticta ‘ group of Papilio swallowtails — P. cleotas ,P. garamas ,P. victorinus , etc.
” as previously identified on our site by Keith Wolfe.  The red horns are a defense organ known as the osmetrium that releases an odor some predators find offensive.

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