The answer to 'why is my ant scratching sounds' is that the scratching or rustling noises you're hearing are likely caused by ants foraging or moving around in your home. Ants make these sounds as they search for food and build their nests inside walls, floors, or other hidden spaces.
Common causes of ant scratching sounds include an ant infestation, with large numbers of ants moving around, as well as the sounds of ants chewing through wood or other materials to build their nests. You may also hear the rustling of ants carrying food or nesting materials. These noises are more common at night when ants are most active.