A Day in the Life of a Hydra

A hydra belongs to the phylum Cnidaria: a freshwater jellyfish that resembles a long, skinny, sea anemone. Its tentacles wave about the surrounding water. Each has stinging cells and when they come in contact with a small fairy shrimp they harpoon it. Poison for the cells immobilizes the shrimp and it is ingested. The hydra has no oral opening. Its cells arrange themselves so as to form an opening to surround the prey, In spite of its small size and low mobility, this is a voracious predator.

http://www.matsuimaging.com/ Copyright Brian Matsumoto, PhD

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