Ключевые слова: alternative, ancient, animal, annelid, annelida, anxiety, background, black, blood, bloodsucker, bloodsucking, care, closed, comprise, dangerous, disease, disgust, doctor, glass, healing, health, hermaphrodite, hirudinea, hirudo, hirudotherapy, hospital, illness, invertebrate, jar, leech, leeching, medical, medicinal, medicine, microbiology, nature, paraphyletic, parasite, parasitic, physic, relief, research, science, skin, specimen, sucker, therapy, water, wet, worm,