Since I've had Guineas I've noticed a decrease in ticks in my yard area and though I credit some of it to them eating them, I also know that it takes awhile for them to learn where and when to find them. Another way that Guineas keep ticks away is keeping the mouse population down and though I have never seen my guineas harassing or chasing mice, I have noticed a steep drop in the mouse population in my house garage and other out buildings, mainly by observing very little mouse poo where it is usually quite heavy, like around the bird seed cans and our sugarhouse. I throw them some millet and scratch around to just keep them around in the colder weather when there is not much out there except some grasses and stuff to browse on. If I don't they tend to wander way to far for my liking looking for things to eat. Everybody has there own ways with these birds and it is taking me some time to figure out how to keep most of them alive with out constantly spending my time herding and chasing them around.
https://entomologytoday.org/2015/03...-the-blacklegged-tick-to-combat-lyme-disease/
https://entomologytoday.org/2015/03...-the-blacklegged-tick-to-combat-lyme-disease/