The answer to 'why is my fire ant scratching sounds' is that the scratching or rustling noises are likely caused by fire ants moving through the soil and building their nests. Fire ants are known for their aggressive and noisy behavior, and the sound of their movement can be quite audible, especially if their nest is located near your home.
Fire ants typically build their nests in the ground, and as they move through the soil to gather food or expand their colonies, they can create a scratching or rustling sound. This sound may be more noticeable at certain times of the day or during specific weather conditions, such as when the ants are more active.