Ключевые слова: alternative, animal, background, beauty, biology, black, bloodsucker, brown, copy, fauna, glass, green, health, healthcare, healthy, hirudotherapy, hospital, ingredient, insect, invertebrate, jar, leech, leeches, light, medicinal, medicine, natural, parasite, pest, research, science, service, session, skin, small, space, suck, text, therapy, traditional, treatment, unconventional, wild, wildlife, worm, zoology,