The process has reached to the end for this project. I had rearranged the ways to present my animations. I divided the screen into three parts (left-middle-right). The middle part is a single Didinium with animated swimming motions. If moving cursor to the left, the Didinium is changed to a paramecium. Then if the space key is pressed, an different animation comes out and shows that paramecium being preyed by a Didinium. In contrast, the right side is an animation shows how didinium are eaten by its predator Copepoda Calanoida. The two sides demonstrate a simple food chain of Didinium being a prey and a predator.
The center part
The animation of both sides
The animations of both sides if the space key is pressed