Winter Days Sound Analysis

Theres this rapid tapping sound that sounds like creaking at the beginning that we hear, immediately the chikusai starts listening to the trees I assume looking for the sound. The sound sort of echoes a bit and makes the forest he's walking through sound vast and thin enough for the sound to carry but thick enough that the sound reverberates off a number of trees to echo that way. The chikusai finds himself at a tree where he listens closely to this scratchy creaky noise that reminds me of wriggly things for some reason, but as he walks away a woodpecker comes up to the tree and starts to peck, causing the rapid creaking sound again. The sounds gets hollower as he moves away from the bird.