Dragonflies sometimes fly in formation.. I watched three in a 'V' formation flying over the yard and house.. The leader point bug triggered mosquitoes to escape.. The other two caught them.. There seemed to be communication between the three... I was hose washing things on the lawn, a large dragonfly got sprayed with water, and dropped to the grass, its wing covered with water droplets.. I picked it up, and dried its wings with a tissue, and released it..