My question is how are your chickens coming into contact with leeches ? Do you have a pond that they drink from ?
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Let me ask again. Do your chickens live in swamp water up to their noses?This was a first experience to me .there wasn't a leech bite in chickens in the time of my grandfather.i saw she was tried to remove it but i helped with some salt. leeches are common in my region
Unless a chicken is covered in leeches, they won't do much harm.