aid
alternative
ancient
animal
annelid
anxiety
black
blood
bloodsucker
bloodsucking
care
closed
crabs
dangerous
detoxification
disease
disgust
doctor
earthworms
education
glass
healing
health
healthy
hematophagia
hermaphrodite
hirudo
hirudotherapy
illness
invertebrate
jar
leech
leeching
medical
medicinal
medicine
nature
paraphyletic
parasite
parasitic
plastic
science
skin
specimen
sucker
therapy
water
wet
wildlife
worm
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