House Mice Identification Guide

What mice look like

House mice are small, slender rodents with large ears, a pointed nose and a long, thin tail about as long as their body. They are usually grey-brown with a lighter belly.

Their droppings are small, about 3–6 mm, dark and pointed at the ends, often found in cupboards, drawers and along walls.

Signs you have mice

• Droppings in cupboards, drawers and behind appliances
• Chewed food packaging, insulation or wiring
• Scratching in walls or ceilings at night
• Shredded nesting material in hidden spots
• A stale, ammonia-like smell

Are they dangerous?

Mice contaminate food and surfaces with droppings and urine, can carry bacteria such as Salmonella, and chew wiring, which can create a fire risk. One pair can produce dozens of young in a few months.

How to prevent them

• Seal gaps larger than 6 mm around pipes, vents and doors
• Install door sweeps and repair garage door seals
• Store food, pet food and bird seed in sealed containers
• Keep firewood and clutter away from the house
• Trim vegetation touching the foundation