Identifying Holes

Where are the holes located?

Structural Holes

Ground Holes

House ground squirrel burrow

Structural Hole Identification

Hole sizes only tell us only what animals could NOT enter the building. For instance, a mouse-sized hole cannot be used by a tree squirrel or skunk, while a raccoon-sized hole can be used by a smaller animal such as a squirrel.

Size of a pencil (3/8″), think: Size of a quarter (1″), think: Size of a baseball (1½”- 3″), think: Size of a grapefruit (4″+), think:
pencil quarter baseball grapefruit
Mouse, Bat Rat, Chipmunk, Flying Squirrel Tree Squirrel, skunk Raccoon