Weld County Colorado Landscape image of a oil well pump jack at an early morning golden sunrise (also called nodding donkey, pumping unit, horsehead pump, rocking horse, beam pump, dinosaur, sucker rod pump (SRP), grasshopper pump, thirsty bird, jack pump, or popping johnny) is the overground drive for a reciprocating piston pump in an oil well. Colorado Fine art nature landscape photography poster prints and stock images by James Bo Insogna (C) - All Rights Reserved. *PLEASE NOTE, WATERMARKS WILL NOT BE ON THE PURCHASE PRINTS*