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Many people hate insects, but the iridescent colors and elegant flying style of dragonflies and damselflies have made them firm favorites worldwide

Credit: Photo by Shodo MTOW Tsukuba, Japan - If a creature with eight legs, a large abdomen, and lots of eyes comes crawling your way, even if you have never seen one like it before, you know instinctively that it is a spider. Likewise, an animal with wings, feathers, and a beak is unlikely to be mistaken for anything other than a bird. The common features of a group of animals that make them immediately recognizable are often called a ground plan or body plan, and have traditionally been used to categorize animals. More recently, researchers have found that comparative embryology, the study...