It was evident that at the base of all of the branches that had died that the bark had been gnawed off by squirrels as you can see in this photo. While I was looking up at the second tree I even caught a squirrel peering down at me. I saw a lot of chewing damage throughout the tree so these oaks have to put up with a lot of abuse from these squirrels. Since this discovery, I have noticed other trees with dead branches throughout the canopy so I figure our squirrel population is doing well.
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