Believe it or not I just found this beautiful caterpillar this week, on October 14, 2020.
It’s not really the time of year I would expect to find it, but here it is.
Also, if you notice this is not the normal color of this species. It would most often be more green with white stripes and yellow spots.
Since it was on a fennel plant in my garden, that gave me a hint of what it might be. When I looked it up, it was noted that once in a while this butterfly’s caterpillar is black. I have never seen this myself in my garden. Interesting!
The Pipe-vine caterpillar is the only other species that has the two colors on a regular basis in my area. So the lesson we have here is that the plant has a lot to do about identifying a species.
I have to say, it’s pretty neat that this caterpillar has the ability to have two different morphs.
I found a dozen of these caterpillars devouring my dill. When there was nothing but a stem left, they crawled up the side of my planter and crawled away. I thought they might find the nearby parsley and ingest it too, but no sign of that and no sign if them.
I suppose they are somewhere nearby spinning their cocoons. Maybe I’ll see some pretty black swallowtails around soon if my nesting phoebes and barn swallows or bluebirds don’t get them first!
From Sue Ann:
I have had many of these in my bronze fennel plant, and I hope they have gone off to pupate, too! The fennel also hosted the caterpillar of the cabbage looper moth. I’ll plant dill next year, for sure. The more black swallowtails, the better!
More about the Black Swallowtail, from Cindy
Papilio polyxenes, the black swallowtail, American swallowtail or parsnip swallowtail, is a butterfly found throughout much of North America. It is the state butterfly of Oklahoma and New Jersey. Wikipedia
Black Swallowtail Life Cycle: Overview and Timings
Generally 4 to 10 days, depending on temperature and host plant
Caterpillar (larval) stage
3 to 4 weeks
Chrysalis (pupal) stage
10 to 20 days (except for overwintering pupae)
Adult butterfly stage
6 to 14 days
Facts about the Black Swallowtail
And More from Sue Ann
I had to add this observation from last night, as I was dining outdoors at the Central Avenue Bistro in Cameron (with safe distancing and all that). I felt something prickling my ankle and looked down to find this fellow. It must be on the last instar, because it’s big! I believe it’s a live oak metria moth (Metria amelia) given that it and many friends were falling from the live oak tree we were sitting under, though iNaturalist has yet to confirm me.
The moth looks like this, which really would blend right in with an oak tree!