Thanks everyone! I know the actual video is not "directed" in any way but I just wanted to capture the movement. After looking at it a couple times I realize I need to coordinate how/where to place the light source for a better view from the camera angle.
Yes, the movement of shadow/light (or at least most of it) is from the actual snake in the egg.
It is very addicting to want to candle them every time I pop the lid for air exchange . . .