Chewing lice are small, wingless insects that primarily infest mammals and birds. They feed on the skin, feathers, or hair of their hosts by chewing, which distinguishes them from other types of lice that suck blood. Common hosts include dogs, cats, and various birds. These pests are typically flat and have a broad body, making it easy for them to cling to their host's fur or feathers. Chewing lice can cause irritation and discomfort, leading to scratching and potential skin infections. They are usually transmitted through direct contact with an infested animal or contaminated bedding.