We had terrible tick problems until we got our guineas. We couldn't step out in the yard/barnlot without pulling several off every time. After the guineas grew up enough to range around, ticks are just gone. They patrol around all day, and I now only do a serious tick check after I've been up in the woods and such. I read somewhere that 3 guineas cover an acre? We have 4 who seem to do well taking care of about 3 open acres with the barn lot, yard, garden area. We have 27 acres in all, but I'd say they cover about 3-4, and they do a great job. I told the kids that they get a spot for every tick they eat.