One-of-a-kind? Or not. USU evolutionary biologist studies formation of new species
(PHYSorg.com Biology)

At what point on the journey along the branches of the evolutionary tree does a population become its own, unique species? And is a species still distinct, if it mates with a different, but closely related species? Evolutionary biologist Zach Gompert of Utah State University explores these questions and more, using plant-eating stick insects of the Timema genus as a research model.