1 human hair preparation and 3 animal hair slides into a resin: dog and cat hair and boar bristle. Objective:Is it easy to differentiate with a microscope the origin of a human and animal hair?Apllication:We lose on average 100 hairs per day. Present on clothing, carpets, rugs, blankets, textile fibers are everywhere and are highly mobile. The fiber and hair deposits can be counted in hundreds in a crowded room. Thus any movement, shock, causes the movement and transfer of these important clues.