The business end of a tree harvester. The speed with which these things work is amazing. They grab hold of a tree; cut it off above ground level; lay it down; wind the trunk through measuring the length and breaking off all the branches as it goes; and then cut it to the desired length(s), all in what seems like a few seconds.

This was one of two sitting in a field close to a small area of forestry, that I'd presume is "for the chop..."