




Every unique kind of these tree beatle larves eat their way out in another way,making patterns.
First time I did see these patterns was when I was a child and recently I did see them in a book about all bugs and insects in Holland.
We have the "boring"part of the family but maybe your tree contains larves creating fern patterns or Fibonachi spirals.
To bad we often only can see these fractal-ish images when they have killed the tree.