Even though it sometimes makes adults cringe, head lice are very common in schools, particularly during the fall and winter months. Head lice are tiny bugs that live only on the scalp of human beings. They are the size of a pinhead. They do not have wings so they cannot fly or jump, and they are not found on cats, dogs, or any other household pet. The bites from head lice cause itching and scratching. Scratching may cause sores which can get infected. Although students can become very uncomfortable with head lice, it is a fairly routine process to eliminate them from the scalp and household. Click on the attachment to get the information sheet entitled "Facts of Lice" from the Hamilton Public Health Services.