Lice are wingless insects and the claws in their six legs are adapted for holding and walking on the hair (Fig. 1). Lice cannot jump or fly. Their mouth parts are designed to penetrate the skin and suck blood. Their color is grayish-brownish, but after sucking blood they may become reddish and dark brown.
The freshly laid louse egg is oval in shape, about 0.8 mm in length, transparent, shiny and has a yellowish-milky color (Fig. 2).