SEEKONK, Mass. (AP) — A wheeled robot named Marty is rolling into nearly 500 grocery stores to alert employees if it encounters spilled granola, squashed tomatoes or a broken jar of mayonnaise.

But there could be a human watching from behind its cartoonish googly eyes.

Badger Technologies CEO Tim Rowland says its camera-equipped robots stop after detecting a potential spill. But to make sure, humans working in a control center in the Philippines review the imagery before triggering a cleanup message over the loudspeaker.

Rowland says 25 of the robots are now operating at certain Giant, Martin'...