Common signs in a Top End home are scratching or scampering sounds in the roof or walls, dark pellet-shaped droppings around 10 to 20 mm, gnaw marks on timber, cables and containers, greasy rub marks along travel paths, and nests made from shredded paper, cardboard or insulation. Pets fixating on a wall or ceiling is another giveaway. If you have noticed any of these, Northern Rock can inspect and bait the property.