I was intrigued by these patterns on a few twigs lying on the lawn. They looked rather creative, like nature's version of scrimshaw.
Google lens kept suggesting this was striped maple bark, but there's no bark at all - this is under the bark layer. Each one has a ring around the branch, with lines reaching out from it in both directions. After much prodding on the Internet, I've decided it must be from one of the insects or beetles that lays eggs in a girdle around a branch. Once the eggs hatch, the larvae move off, eating a path outwards from the original area until they emerge from the bark.
It does not appear to be the bug known as a twig girdler since that chews a girdle through the entire branch causing it to snap off. I don't know exactly which insect it is, but it doesn't appear to be the Emerald Ash Borer, whose pathways are usually s-shaped and sinuous.
Impressive!
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