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Hydra is a genus of freshwater cnidarian polyp known for their ability to regenerate their entire body from tissue pieces. Despite their simple body plan and tissue organization, Hydra is capable of complex behaviors, including capturing and consuming live prey, somersaulting locomotion, and phototaxis. Hydra make ideal model organisms for college and high school biology labs because they are easy to grow in large numbers and regeneration experiments can be carried out with minimal resources. The inexpensive setup described here allows time-lapse imaging of the behavior of Hydra, or other small invertebrates, with a cell phone camera. An imaging chamber is constructed out of cardboard. The sample is illuminated by a USB-powered LED panel and magnified by an inexpensive plastic lens. We also provide example movies and instructions for importing cell phone videos into ImageJ.
Callen Hyland (Tue,) studied this question.