Unknow Bug…
Location:  Sudbury, Ontario, Canada
September 29, 2010 5:24 am
Can you please identify this ”bug”? I noticed this guy on my fathers deck about a 5 weeks ago. He is about as big as your thumb, and was waving his ”head” about when first noticed.
Signature:  Dan

Tiger Swallowtail Caterpillar

Hi Dan,
This is the Caterpillar of a Tiger Swallowtail, though we cannot say for certain if it is a Canadian Tiger Swallowtail,
Papilio canadensis, which is well documented on BugGuide, or the Eastern Tiger Swallowtail, Papilio glaucus, also depicted on BugGuide, as the ranges of the two species overlap and they look quite similar.  Both species have green caterpillars that turn orange or brown and leave the trees where they have been feeding as they prepare to pupate.

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