leech on the glass. bloodsucking . subclass of ringworms from the belt-type class. hirudotherapy

aid alternative ancient animal annelid background belttype biology black blood bloodsucking care class closed dangerous disease disgust doctor glass healing health healthy heparin hermaphrodite hirudotherapy hospital illness invertebrate leech leeching medical medicalleech medicinal medicine nature parasite physic pot procedure ringworms science skin slice specimen subclass suck sucker suction tentacle therapy water wet wildlife worm