20110709_stp003 In the Economist:

UNTIL recently, most robots could be thought of as belonging to one of two phyla. The Widgetophora, equipped with claws, grabs and wheels, stuck to the essentials and did not try too hard to look like anything other than machines (think R2-D2). The Anthropoidea, by contrast, did their best to look like their creators—sporting arms with proper hands, legs with real feet, and faces (think C-3PO). The few animal-like robots that fell between these extremes were usually built to resemble pets (Sony’s robot dog, AIBO, for example) and were, in truth, not much more than just amusing toys.

They are toys no longer, though, for it has belatedly dawned on robot engineers that they are missing a trick. The great natural designer, evolution, has come up with solutions to problems that neither the Widgetophora nor the Anthropoidea can manage. Why not copy these proven models, the engineers wondered, rather than trying to outguess 4 billion years of natural selection?

The result has been a flourishing of animal-like robots. It is not just dogs that engineers are copying now, but shrews complete with whiskers, swimming lampreys, grasping octopuses, climbing lizards and burrowing clams. They are even trying to mimic insects, by making robots that take off when they flap their wings. As a consequence, the Widgetophora and the Anthropoidea are being pushed aside. The phylum Zoomorpha is on the march.