Increasing numbers of innovative researchers borrow from biology when they examine and incorporate living systems into man-made designs. We know how man-made designs originate— people design them. But what about living designs? Two recent biomimicry research programs let slip major logic errors when accounting for the origin of the creatures they copy: the seahorse and kangaroo.

People instantly recognize intelligent engineering in a structure that has optimized size or shape. Optimum parameters don't just happen. So when two mechanical engineers recently discovered optimum sizing in locust legs, to what did they attribute that high level of engineering?