Several years ago, I found a time-lapse video of a baby pig decomposing. Yes, there is quite a bit of movement caused by the various decay processes. The body bloats and deflates, the limbs move around when rigor mortis relaxes, and also as the tissues degrade. In the time-lapse, the body is never still. There is life in the body, the life of the billions of microorganisms that consume the tissues during the process of decomposition.
I watched the video with my son. We both found it fascinating.
Sorry I missed that. /rimshot
Thanks for demystifying this piece...