What the heck is making these holes?

   / What the heck is making these holes? #382  
They are approximately 3/8 inch. Some I found were only 1inch deep others were longer than the straw for the insect spray can (maybe 5 inch).
 
   / What the heck is making these holes? #383  
Those are carpenter bees. They drill round holes in wood. The OP has holes that are about an inch in diameter.
 
   / What the heck is making these holes? #384  
Those are carpenter bees. They drill round holes in wood. The OP has holes that are about an inch in diameter.

Exactly and those bees create holes in an upward fashion for making a nest. Not downward and completely through.

As for chipmunks, they sure can make a mess.
 
   / What the heck is making these holes? #385  
Still thinking they are re-used boards from a previous structure.

Photo from:
https://www.tractorbynet.com/forums...king-these-holes-post5424777.html#post5424777

holes.JPG

Bruce
 
   / What the heck is making these holes? #386  
   / What the heck is making these holes? #387  
   / What the heck is making these holes? #388  
I forget if this was discussed, but as floor boards could they have been repurposed boards from another use where they would have had those holes to start with when they went onto the floor?
 

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