Answer: bulldozers

AnswerCrossword Clue
BULLDOZERSEarthmovers
BULLDOZERSCaterpillars
BULLDOZERSThey're used to make the grade
BULLDOZERSBovine earthmovers?
bulldozersBULLDOZER, a powerful, heavy tractor with a vertical blade at the front, used for levelling and clearing land
bulldozersA person, army, or other body exercising irresistible power, esp. in disposing of obstacles or opposition
bulldozersA powerful tractor with a broad upright blade at the front for clearing ground