Didinium Video No. 1
Didinium is an oval-shaped ciliate that lives in freshwater habitats and is frequently seen in samples of pond water. It preys almost exclusively on Paramecium, injecting trichocysts into its prey when it bumps into it. These paralyze the much larger organism and making it possible for Didinium to engulf and ingest it. The trichocysts are only ejected when it bumps into something it's interested in eating.
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