The robots were built by Kiva Systems, a robotics company that Amazon bought in 2012. Amazon now has over 15,000 of the Kiva bots across 10 fulfillment centers, according to TechCrunch.

Amazon will still need 80,000 seasonal employees to handle tasks requiring dexterity, like packing a box.

But the company’s need for human workers may dissipate as robots get smarter and more nimble—and as more customers demand same-day delivery on their Tickle Me Elmos.

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