There’s a pair of Black-capped Chickadees nesting in the trunk of the neighbors’ crabapple tree right outside our front fence, and they are frequent visitors to our feeders and bath. One of them (for some reason, I’m thinking the male) keeps landing on the fence to peck at the top of the slat.
Backyard. April 25, 2020.
As far as I know, there aren’t any bugs in that wood. I never see the chickadee come up with anything in his beak. It’s possible it’s a territorial thing, making a drilling sound to warn off other males. Or, maybe this bird’s into pointless, repetitive behavior that may or may not give him a headache. What a silly bird, right?
Then I thought of how I return, over and over again, to Twitter where I’m confronted, over and over again, with example after example of humans being ignorant, hateful, selfish, greedy, thoughtless, hypocritical, and more.
Obviously, I’m in no position to judge this chickadee for knocking his head against the fence.
Tracy Abell 
I would bet this is territorial behavior.
So stop that Twitter behavior, woman! (lol)
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I think you’re correct on both counts, Sandy! That’s for the slap on the wrist. 🙂
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Yes! Birds and far two many people do tweet. With people it can be antisocial.
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Ha! That’s a fact!
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He might be trying to choose a nesting site. They make holes in soft or rotting wood. Usually in old stumps or will used old woodpecker nests. Keep an eye on your fence. 😊
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They’re nesting in a crab apple tree outside the fence, so I’m thinking territorial behavior. Either way, it’s great fun having them around so much.
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It’s always fun to watch birds. 😊
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