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Termite droppings are important evidence of colony presence. These 1mm granules with distinctive ridges appear like coffee grounds and vary from cream to dark brown based on the wood type consumed. Finding termite frass near window sills indicates potential structural pest evidence (https://scholarlyresources.digitalscholarship.brown.edu/doku.php?id=identifying_termite_droppings:your_complete_guide_to_termite_spot) damage requiring urgent expert treatment.