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Species of Haematopinus are large lice measuring about 4 mm with prominent ocular points but without eyes. Louse populations build up during the winter when the animal's coat is longer and thicker. Heavy infestations are associate with marked anaemia and loss weight. Haematopinus tuberculatus, the buffalo louse, is the largest species of the genus occurring on ruminants, measuring 5.5 mm, but is not considered of any great importance.