Mice can enter openings as small as:

Mice can enter openings as small as:

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

Answer: (D)

Mice can get through surprisingly small openings because their bodies can squeeze and they have narrow head shapes. The smallest opening they can enter is about 1/4 inch in diameter. So among the given sizes, the quarter-inch gap is the smallest that would still allow entry. An opening of 1/8 inch is too small for them to pass, while 1/2 inch and 3/4 inch are larger than needed but still would permit entry; the key point is focusing on the smallest hole that can admit a mouse, which is 1/4 inch. This is why sealing gaps at or below that size is important in pest-proofing.

Mice can get through surprisingly small openings because their bodies can squeeze and they have narrow head shapes. The smallest opening they can enter is about 1/4 inch in diameter. So among the given sizes, the quarter-inch gap is the smallest that would still allow entry. An opening of 1/8 inch is too small for them to pass, while 1/2 inch and 3/4 inch are larger than needed but still would permit entry; the key point is focusing on the smallest hole that can admit a mouse, which is 1/4 inch. This is why sealing gaps at or below that size is important in pest-proofing.