@shiningeyes , if your ducks have lice or mites, and what you described crawling on your arm sounds like a louse, the ivermectin with treat them. If they have a duck house that will need to be stripped of bedding and sprayed with permethrin spray.
If by chance what you saw was a flea you will need to treat the ducks and their house with permethrin spray because ivermectin does not treat fleas.
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I use Ivermectin Pour On on my ducks for lice/mites/fleas and it is definitely effective... I do treat coops and bedding with permethrin spray as well... that combined is very, very effective in clearing out any external parasites...
Fyi, fleas DO live on their host... just ask a cat or a dog...
