According to MedlinePlus lice are parasites and they don't have any wings. But lice have legs so that they can jump from head to head and they are very contagious. Also according to MedlinePlus some ways you can get head lice is if you use someone else's hat, or brush. According to KidsHealth lice take very small amounts of blood from the scalp, the human brain senses the lice bite and sends a message through your body, telling you to itch the area, causing you to pay attention to it. The reason for this is because the brain understands that there is something wrong with the area/body, and it wants you to notice it. Head lice moves from head to head and they spread. If something moves or spreads it means they are living, and when something is living it is made up of cells.
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