We are seeing lots of tobacco hornworms chomping at tomato plants in the last week. The one in the image below has been parasitized.
Normally we don't continue to observe what happens after that. This last Tuesday we actually saw one in a much later transition. Notice how the hornworm's body is now shriveled and brown and the white cocoons have opened to release a new generation of parasitic wasps.
I am amazed at the built -in structure of the cocoons. The tops are lightly hinged, with a perfect circular cut. It's all too perfect to comprehend.
You can read more about hornworms at the GIEI website. Remember not to disturb parasitized caterpillars! They will not eat more of your plants. Let the wasps hatch out and go on to make more wasps.