My ex just sent me this:<quoted text>I don't think that's a swallowtail. Especially if its on milkweed.
The swallowtails we've hatched make a brown cocoon on a wood branch and it doesn't hang, but is solidly attached and angled upward.
It blends very well with the bark.
One year, one of our swallowtail caterpillars cocooned very late in the season. My wife was worried that it would hatch too late to survive, but it never did. She put the jar with the cocoon on a shelf in the basement behind some other junk.
The following March, I was looking for something and happened to move something from in front of the jar and saw something move in it.
I couldn't freaking believe it. There was a live, perfect swallowtail fluttering around in the jar.
There's actually another one right now on her breezeway desk. We're wondering if its going to survive.
You may have a Queen butterfly.