Here in the Pacific N.W., I run into a lot of Deer Mouse invasions. The typical scenario is a bird feeder that is close to the house, and the house is near some natural area. There is a lot of misinformation about this species on the net. In this environment they are year around invaders of structures. They are great climbers and often migrate into attics. They love to chew on phone and Internet cabling and usually leave the power lines alone. This is a good thing. Their signs are distinctive to an experienced professional. It is imperative that the person treating the structure know which species is present. Deer mice require a different, knowledgeable approach to controlling the infestation.
Call 503-579-3680 (ask for Randy)

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