What size openings can mice squeeze through?

What size openings can mice squeeze through?

• A. 1/2 inch
• B. 1/4 inch
• C. 3/8 inch
• D. 1 inch

Answer: (B)

Mice can get through surprisingly small openings because their bodies are compact and very flexible. The smallest opening they can squeeze through is about 1/4 inch in diameter, roughly the thickness of a pencil. That’s the threshold at which entry becomes possible; openings smaller than that are generally too tight for a mouse to pass. So the best answer reflects this minimum entry size. In practical pest-proofing, seal gaps no larger than 1/4 inch to prevent mice from getting inside. Larger gaps, such as those around 1/2 inch, 3/8 inch, or 1 inch, are all capable of allowing entry, but they illustrate openings bigger than the minimum that mice can already exploit.

Mice can get through surprisingly small openings because their bodies are compact and very flexible. The smallest opening they can squeeze through is about 1/4 inch in diameter, roughly the thickness of a pencil. That’s the threshold at which entry becomes possible; openings smaller than that are generally too tight for a mouse to pass. So the best answer reflects this minimum entry size. In practical pest-proofing, seal gaps no larger than 1/4 inch to prevent mice from getting inside. Larger gaps, such as those around 1/2 inch, 3/8 inch, or 1 inch, are all capable of allowing entry, but they illustrate openings bigger than the minimum that mice can already exploit.