Wingless parasites, such as LICE, are small insects that feed on the blood of their hosts. LICE are a common example of wingless parasites, and they can be found on humans, animals, and birds. They are usually spread through direct contact with an infected person or animal, or through contact with contaminated items such as clothing, bedding, or furniture. LICE infestations can cause itching, skin irritation, and other health problems. Treatment for LICE typically involves the use of special shampoos or creams.