Ключевые слова: alternative, animal, background, beauty, biology, black, bloodsucker, brown, fauna, glass, health, healthcare, healthy, hirudotherapy, hospital, ingredient, insect, invertebrate, isolated, leech, medicinal, medicine, natural, one, parasite, pest, research, science, service, session, skin, small, suck, therapy, top, traditional, treatment, unconventional, view, white, wild, wildlife, worm, zoology,