Amazon's expanding fleet of robots includes: Hercules, a lifter capable of handling 1,250 pounds; Pegasus, which sorts packages on conveyor belts; and Proteus, the company's first fully autonomous robot able to operate directly alongside people.

Amazon is close to having more robots operating inside its warehouses than humans after the e-commerce giant announced this week that it now has more than a million robots working at its facilities around the world.

Technology is catching up to the U.S. workforce very quickly and one company is leading the way with robotics — which isn't exactly good news on the jobs front. The Wall Street Journal did a deep dive into Amazon's quest to automate tasks that have been done by its employees for decades.