What caused holes in my tree

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The evergreen tree in the backyard has a series of little holes going horizontally all the way up the trunk. Wondering what caused them--- woodpecker? I've never seen any around, so wondering what could it be?
what caused holes in my tree, gardening, landscape, little holes in the trunk of my tree
little holes in the trunk of my tree
what caused holes in my tree, gardening, landscape, closer look at the trunk
closer look at the trunk
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