sentences:  Rodent infestations can be identified in the usual ways, such as seeing droppings, nests, or comparatively large chewed areas of textile where they have caused damage.In all cases, chemical means of pest control should be avoided if possible, not only due to harm to humans who come in contact with them, but because the chemicals may cause damage to the very textiles the conservator is trying to save.For rodents, snap traps may be effective, and if needed, a professional exterminator should be called.