the black ones were probably duck lice and i'm not sure about the white ones.
we get duck lice on them early in the season but they disapear quickly.actualy last year second day i found a bird that i'd lost with leaches on it.
I have a system I use in Whitetail hunting during the rut that seems to work for me. When I make a mock scrape in the area I wish to hunt I will place a couple of 35mm
film canisters (film removed of course) in the scrape after I have cleared out all leaves and other debris. The film canisters are filled with cotton balls and saturated with doe in heat urine. This keeps the urine from soaking in the ground and can be refreshed on each trip if needed. I will also use the tarsal gland of the buck...