House Mouse

When using snap traps to control mice, what is the recommended spacing between traps in active areas?

• No more than 5 feet apart
• No more than 10 feet apart ✓
• No more than 20 feet apart
• No more than 30 feet apart

Answer: Snap traps work well when set out in numbers at well-chosen spots; in active areas, space them no more than 10 feet apart.

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When attempting to distinguish a house mouse from a native deer mouse, which physical characteristic is the most reliable indicator?

• The size of the ears
• The color of the coat
• The amount of fur on the tail ✓
• The size of the eyes

Answer: The quickest tell between a house mouse and a native deer mouse is the tail: a house mouse's is nearly bare, a deer mouse's fairly to heavily furred.

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Which of the following describes the typical size of a house mouse's gnaw marks?

• Exactly 1/4-inch wide
• Approximately 1/2-inch wide
• Roughly 1/32-inch across ✓
• Approximately 1 inch across

Answer: Fresh gnawing roughly 1/32-inch across is another giveaway, and mice often chew clean, 1½-inch round holes through cardboard and similar materials.

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In what scenario is professional treatment specifically recommended?

• For any sighting of a single mouse
• Only when mice are found in the winter
• For established or recurring indoor infestations ✓
• When mice are found in gardens or outdoors

Answer: Professional Recommended: yes for established or recurring indoor infestations

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According to the provided text, what is the maximum distance a house mouse is reported to stay from its nest and food sources?

• 30 feet
• 50 feet ✓
• 60 feet
• 100 feet

Answer: The reported limit differs by source: no more than 30 feet from the nest and food [UC IPM], or within about 50 feet of shelter and food [UNL].

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Which symptom is characteristic of mouse droppings found during an inspection?

• They are piled up in large mounds
• They are approximately 1/2-inch long
• They taper to a point at one or both ends ✓
• They are perfectly spherical in shape

Answer: Rather than piling up, mouse droppings scatter; each is about 1/8- to 1/4-inch long and tapers to a point at one or both ends.

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What is the estimated percentage of house mice nationwide that carry and spread the Lymphocytic choriomeningitis (LCM) virus?

• Less than 1%
• Approximately 5% ✓
• Approximately 10%
• Over 25%

Answer: Roughly 5% of house mice nationwide are thought to carry and spread the LCM virus [UC IPM]; the Pennsylvania Department of Health LCM fact sheet likewise puts the share of U.S. mice carrying LCMV at about 5%.

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