LEGO DUPLO Dump Truck and Excavator - 10931. The LEGO DUPLO Truck & Tracked Excavator (10931) encourages little builders to engage in endless imaginative play. As toddlers embark on construction site adventures with the toy truck, excavator, and 2 construction workers, they develop valuable physical and cognitive skills that will benefit them throughout their lives. The 2 construction worker figures, dump truck with tipping function, and excavator with rotating shovel offer toddlers and their parents everything they need to get the job done. Children develop their fine motor skills as they drive and operate the vehicles to perform various tasks on the construction site. They can scoop up toy bricks and load them into the truck. But watch out, the boulder easily splits open! What is the best construction toy for young children and toddlers? The LEGO DUPLO Construction range of playsets is designed to provide toddlers with toys that support their development. The sets can be combined for even more play possibilities.