Mice

Recognize the signs

Whole animal

House mice are usually grey-brown with a nearly hairless tail; deer-mouse relatives commonly have white feet and underside and a two-coloured, furred tail.

Fresh evidence

Gnawed food, nests, sightings and recurring droppings together are more useful than a single old dropping. Do not touch or crush waste to identify it.

Look more closely

Compare the labeled examples and their limits. Images are independently enlarged, not shown at a common scale.

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Differences that change the decision

A similar-looking organism can need a different response. Compare the evidence and what it changes.

Compare every column. On a narrow screen, scroll the table sideways.

What else could it be?

Young rat

Relative feet, head and body proportions can differ, but size alone misleads.

Compare rats ↗

Vole or shrew

A short-tailed lawn rodent or pointed-snouted insect eater may need different identification.

Compare burrowing wildlife ↗

Inspect the right places

1. Map activity before cleaning

   Photograph from a distance and mark food damage, sightings and entry gaps. Check pipes, door edges, vents and wall junctions; mice can use openings around one-quarter inch.

2. Assess the cleanup setting

   Heavy contamination, ventilation ducts or inaccessible nesting need professional advice before disturbing material.

Choose a proportionate response

For pesticides, the local product label determines the allowed pest, site, precautions and timing. Check safety and regional guidance.

1. Protect resources

   Store human and pet food in sturdy closed containers, remove spills and repair water leaks.

2. Exclude and trap together

   Use durable, gnaw-resistant repairs. Place mouse-sized snap traps along confirmed routes in locations or protective enclosures inaccessible to children and pets.

3. Check every day

   Inspect traps daily and record captures and fresh signs. Keep trapping while correcting missed access.

4. Prepare before cleaning

   For a home or outbuilding, open doors and windows for 30 minutes and leave during ventilation. Wear rubber or plastic gloves. Heavy contamination or rodents in ventilation systems need qualified help.

5. Wet-clean droppings and surfaces

   Never dry sweep or vacuum rodent waste. Thoroughly wet urine and droppings with a suitable disinfectant; wait five minutes or the label contact time. Wipe with paper towels into covered rubbish, then disinfect hard surfaces. Wash gloved hands before removing gloves, then wash bare hands with soap and warm water.

6. Dispose of dead rodents and nests

   Wearing gloves, soak the rodent, nest and surrounding area with disinfectant for five minutes or the label time. Seal the waste in one bag, then a second bag, and use covered rubbish or local disposal instructions. Wash gloves before removal and hands afterwards. Follow CDC’s full instructions for reusable traps, other materials and special settings.

Avoid these mistakes

• Do not use loose poison where children, pets or wildlife can reach it.
• Do not treat a quiet night as proof that entry is fixed.
• Do not rely on ultrasonic repellents or a pet to clear an infestation.
• CDC advises against glue boards and live-capture traps for mice and rats: frightened rodents may urinate and increase exposure. Use correctly sized snap traps with protected placement instead.

Check whether it is working

Prevent a return

• Inspect door sweeps and utility gaps after repairs.
• Keep stored goods off cluttered floors and inspect little-used rooms.
• Coordinate shared-building entry repairs with the responsible manager.

Common questions