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The biting louse of sheep causes the fleece to become matted and tufts of wool are pulled out.

We should examine the parts of the skin covered by the long hair for the sucking lice; and the withers, abdomen and limbs for the biting lice.

Different species of sucking and biting lice occur on the different species of farm animals.

The biting louse may bite through the superficial layer of the skin, and cause the animal to bite and rub the part.