Mice and rats sometimes cause a great deal of damage to paper and plastic. They can easily gnaw through packaging made of these materials and often use the fragments as nest material.
The activities of these rodents can be recognised by the tooth marks (p. 84), which can always be identified, even in the thinnest sheet of newspaper. They might be confused with holes torn by a cat or a marten, but here one would normally see distinct claw marks.
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