Is this a plum curculio larva? I know the pictures aren't that great --- it wouldn't sit still for me. It's in the center of each of the peaches on my tree. As you can see in a later picture, the fruit has a bit of gum marking the entrance of the insect. The centers of the peaches are full of frass.

When I pulled one of the larvae out, I could tell that it had a brown head, but couldn't get it to sit still long enough to really look at the legs. It clearly had some sort of legs --- maybe three bigger ones in the front and then several prolegs, but they could also have easily all been prolegs.

I was picking up the larva on the end of a knife, and it spun a silk thread to dangle below the knife. Then it started twirling vigorously, I guess to work its way back up the thread?