Rats are notorious for being quiet intruders in homes, often revealing their presence only when the infestation has grown out of control. One of the most common signs is the presence of droppings, which are typically found in concentrated areas like kitchens, attics, or garages. These droppings are pellet-shaped, usually around ¼ to ½ inch in size, and can appear in small or large quantities depending on the severity of the infestation. Another telltale sign is the presence of gnaw marks on furniture, food packaging, or even electrical wiring, which can pose a serious fire hazard. You might also hear scratching or scurrying noises, especially at night when rats are most active. If you notice a persistent, musky odor or see smudge marks along walls or baseboards (caused by the oils in their fur), these are strong indicators of a rat problem. Additionally, spotting a live or dead rat is an obvious sign that you need immediate intervention.