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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 of how different animals develop at the embryonic stage, can also shed light on the ground plan of a group of animals and help identify their evolutionary history. ....