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Unusual times, remarkable places

The "Standard of Ur" from ancient Mesopotamia

The "Standard of Ur" from ancient Mesopotamia

05 April 2016

Stuff in my yard: My caterpillar transforms

In my last blog post (, I had a photo of a Monarch butterfly (Danaus plexippus) caterpillar, fifth instar, on a milkweed plant in my yard. I brought it inside, put it in a lettuce container with some sticks, and fed it milkweed every day. 

Yesterday, it stopped eating and roamed its enclosure in apparent distress. About 8:30 pm when we checked it, it was hanging in a J shape, the sign that it is preparing to shed its last skin and reveal a chrysalis:

Monarch caterpillar in J shape

(Please excuse the poor picture you see if you blow it up. The light was bad, and I had forgotten we had a tiny, usually useless tripod. This was taken at about 1/20 s.)

This morning, I checked the caterpillar several times, and at about 10 am, it was wiggling around. After the first shot, I set up the camera on the tripod. Over the next few minutes, the caterpillar's skin peeled off:

Then it did what one book calls the "chrysalis dance" to get completely rid of its skin:

beginning of chrysalis dance

You can see above that at first, the previous stripes were still visible. Two hours later, it looked like this:

The chrysalis is fully formed but still has dead skin attached and light striping. 

Once the old skin drops off, I'll be able to discover whether it's female or male.

Now to wait. According to my caterpillar book, it will turn into goo inside and slowly reconstitute itself as a butterfly. It should emerge from the chrysalis in one to two weeks. I'll photograph its emergence for you if I'm lucky enough to see it.

Meanwhile, I'll continue to check my milkweed plant for eggs and more caterpillars.


Jude-Marie Green said...

Amazing! Thanks for the photos of this and the commentary.

Charles Gramlich said...

We had a caterpillar on the deck yesterday but I didn't see a pupae around today