The skidding of full trees is commonly a mechanized sub-process. For the extraction of full trees several options are available.
The clam-bunk skidder and grapple skidder are normally used only for the skidding from the trail (buffer 21) to the forest road (buffer 31). Whereas the cable yarder and the cable skidder can be taken not only for the skidding but also for the pre-skidding of full trees (buffer 11 to 31).
The transportation of the full tree by cable skidder, grapple skidder or clam-bunk skidder is executed in a dragging movement, the transportation with the cable yarder in a carrying movement.
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