dragonflies

Cloudy. Noticing dragonflies in the back yard last night. Initially I thought they might be gathering for their annual flight south, but it's too early for that. The migration takes place in September. I went outside to watch. There must have been 50 dragonflies zooming around the back yard, and back field. I noticed that there were small insects rising out of the lawn, and into the sky. The dragonflies were feasting on them. It was very similar to the hatch that occurs in a stream or lake. The nymphs rise from the bottom, and transform themselves into mayflies. The trout go into a feeding frenzy that sometimes makes the water look like it is boiling. This is the first time I've ever observed this phenomenon with dragonflies.