Black Rat

Black rats, also called roof rats, are agile rodents that often seek shelter indoors as temperatures drop. They are excellent climbers and prefer to nest in attics, upper floors, and wall voids. During December, food sources outside become scarce, so these rats move inside homes and buildings in search of warmth and food. Their presence can be identified by droppings, gnaw marks, and scratching noises in walls or ceilings. Black rats can contaminate food and spread diseases, making them a significant winter pest.

House Mouse: House mice are small rodents that are highly adaptable and can squeeze through tiny openings to enter buildings. In December, the cold weather drives them indoors where they look for food and nesting sites. They reproduce quickly, so even a small number can become a large infestation over the winter months. House mice are known for chewing on wires, insulation, and stored items, which can lead to property damage and potential fire hazards. Their droppings and urine can also contaminate food and surfaces.

German Cockroach: German cockroaches are small, light brown insects that thrive in warm, humid environments, making kitchens and bathrooms ideal spots during winter. In December, they are more likely to be found indoors because outdoor conditions are too harsh for their survival. They hide in cracks, crevices, and behind appliances, coming out at night to search for food and water. German cockroaches can multiply rapidly and are known to spread bacteria and allergens, which can trigger asthma and allergies.

Cluster Fly: Cluster flies are larger than house flies and are known for gathering in large numbers inside homes during colder months. In December, they seek out warm, protected spaces such as attics, wall voids, and unused rooms to overwinter. They are sluggish and often seen clustering around windows on sunny days as they try to escape. While they do not breed indoors or cause structural damage, their presence can be a nuisance, and dead flies can attract other pests.

Boxelder Bug: Boxelder bugs are black insects with red or orange markings that become a common indoor nuisance in winter. As temperatures drop, they look for cracks and gaps in buildings to enter and hibernate. In December, they are often found in wall voids, attics, and around windows. While they do not bite or cause damage to structures, their droppings can stain surfaces, and large numbers can be bothersome to homeowners.

Brown Marmorated Stink Bug: These shield-shaped bugs are known for emitting a foul odor when disturbed. In December, they seek shelter inside homes to escape the cold. They enter through small openings and hide in attics, basements, and wall voids. While they do not harm people or pets, their presence can be unpleasant, and they may become active on warmer winter days, appearing around windows and lights.

Silverfish: Silverfish are small, silvery insects that thrive in damp, cool environments. During December, they are more likely to be found indoors, especially in basements, bathrooms, and kitchens where humidity is higher. They feed on starchy materials like paper, glue, and fabrics, which can lead to damage of books, wallpaper, and clothing. Silverfish are nocturnal and often go unnoticed until their numbers increase or damage becomes visible.