Rangeomorphs, which lived about 565 million years ago, are often considered to be some of the first animals to evolve on Earth, but they share little in common with modern critters - they look more like plants. But according to a new study, their reproductive techniques were astonishingly complex - and familiar, too. The research used statistical analysis to determine what kind of reproductive strategy was used by the genus Fractofusus, a type of rangeomorph. Based on the population distributions found in fossils, the researchers report, these creatures used a two-pronged reproductive approach. They may even have been the first group to develop such a nuanced plan for populating the world.