Most street-based delivery robots take the form of a compact, wheel-based vehicle with a secure compartment for the item that’s out for delivery.

But one major issue affects such contraptions: They can’t handle things like stairs, rough ground, or other challenging terrain, a fact that prevents them from trundling right up to someone’s front door.

Swiss startup Rivr saw a gap in the market and earlier this year unveiled Milo, best described as a highly versatile robot dog — similar to Boston Dynamics’ Spot robot — with a box on its back for for holding delivery items.

Milo, too, is on wheels, but its legs are so astonishingly versatile that when it comes up against something like a set of stairs, it just walks straight up (or down!) them.

Rivr is eyeing the last-mile delivery secto

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