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The next question can be found by following this hint:

Continue along the path until you meet the wise old owl. Follow his steady gaze across your way to find the Flagspett nest in the Gråor (Salix Incana) tree, it looks more like a hollow!

Eager to learn more?

The bark beetles reproduce in the bark of the tree! During mating season, one single male beetle can be followed by up to fifty female beetles.

Read about them here.