Whizzing and whirring past us are these insects that most of us remember as ‘helicopters’ of our childhood. Often subjected to our harsh fascination, these winged beauties were tied a string to their bodies, and flown around. Dragonflies and damselflies, collectively known as Odonates, were once as interesting to us as dragons and damsels of stories. Yet today, we barely have the time to notice these creatures. Here are 7 ‘must-know’ facts about these dainty creatures that are efficient predators of mosquitoes we so dislike, and could be very important bio-indicators of a healthy environment.