Caption: Zooplankton
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Zooplankton is the common name given to many small species of animals found in fresh and marine waters throughout the world. The word zooplankton, derived from Greek, means "wandering animals." They float in the water column and drift with the currents. Most of these animals are so minute they are visible only with a microscope, although some species can reach lengths of eight feet (jellyfish, which can grow as large as 8 feet, with tentacles up to 200 feet).