Watching dragonflies dart among the plants on a riverbank or at the edge of your pond is one of the joys of summer. But do you know a Southern Damselfly from a Variable Damselfly? Or can you tell the difference between a Scarce Chaser and a Keeled Skimmer? Dragonflies and damselflies - known collectively as Odonata - are some of our most fascinating insects. Although they only live for a short time, they have many behaviours that are easy to observe,...