Here is another movie I just made by taking sets of sequential pictures and then combining them in Windows Movie Maker. This one shows the eastern U.S. native slug Megapallifera mutabilis.
Note the slug's pneumostome (the breathing hole) towards the back of its head. In the beginning of both sequences, the pneumostome was open and then it closed.
The slug didn't like the bright lights I had shining on it and so it kept turning away from the camera. Hand-holding the camera at high magnifications invariably introduces instability. I may have to get a table top tripod.
My 1st gastropod movie was here. Part 1 of this series was this post from April 2006.