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Green caterpillar with a long, thin, yellow line along body and a humped rear. Tiny black spots can be seen within the line.
Found on an oak tree
Caterpillar became lethargic and the next day was surrounded by parasitoid wasp larvae. The wasp larvae were in the process of leaving the caterpillar's body, and we're spinning protective cocoons. The caterpillar was already becoming protective of the wasps. I decided to kill the caterpillar quickly, and then feed the whole lot to a nest of ants. Being eaten from the inside and protecting what invaded you until you starve is a bad way to go. The ants were smart enough to tear apart the cocoons to get to the wasp larvae.