Leeches Copyright Randall Schietzelt & Harper College Medicinal Leech Hirudo verbena Parasite Pollution indicator species Leech species, head Stream species Pollution indicator species Leech species Pond species Pollution indicator species Leech species Parasite Pollution indicator species Leech species Stream species Pollution indicator species Leech Sp. Lake Species Pollution Indicator Leech species, head Stream species Pollution indicator species Leech sp. Carnivore or Parasite Pollution Indicator Leech species Microscopic view Pollution indicator species

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