Walking excavator
The term walking excavator may apply to two different forms of heavy equipment, the historic walking power shovel or dragline excavator that began to appear already early in the 20th century, or the contemporary version of all-terrain excavator popularly known as a spider excavator. The original walking excavators were enormous and unwieldy machines which alternately raised and lowered sets of foot plates or sections of tracks to maneuver in all directions - albeit typically very slowly.