Amazon hires a lot of people. But the expansion of its army of orange-wheeled robots is more than keeping pace. An anonymous reader writes: E-commerce and cloud giant Amazon has revealed that it now has 45,000 robots across 20 fulfilment centres around the world. This is a 50 percent increase on the same time last year, when the company said that it employed 30,000 robots alongside its 306,000 people. Amazon uses the robots to automate the picking and packing process at large warehouses. The robots are 16in tall and weigh 145kg. They can travel at 5mph and can carry packages that weigh 317kg. The robots became part of the company's workforce when Amazon acquired Kiva Systems in 2012 for $775m.