There are a lot of species of Dragonfies
Some are called bog hunters, these will normaly feed over small ponds etc, Another group is called stream cruisers that hunt for food over slow moving streams Another group are night fliers, that is they only hunt at night about 18" to 2 ft off the soil line. There is another group called sitters, they sit on a leaf, post, or car antenna, when a bug flies by the jump up to get it, and then return to their perch. These are fun to watch These, if you are very patient, you can get them to walk of a leaf and onto your hand. ~ what an awsome high ~ Then there are High Flyers, they fly about 10 to 30ft off the ground. Mine are usually around when when flying ants migrate, Then my sky looks like the last air raid scene from Tora, Tora, Tora.. Dragonflies eat softbodied insects from fungus gnats to house flies and everything between. They have been eating May flies since the Jurasic era, ( the only 2 insect survivors) Best is that also eat Maine blackfies and skeeters. To have dragonflies in your garden, you will need to stop using the high powered insecticdes for about 3 years, Your local ponds and rivers need to be free of nitrates and pesticides. You need to accept some insect damage on your plants. But after another 3 years it really pays off, I killed less than a dz bean aphids this year, For a fun read, search Green Darner, This little 1 5/8" long insect flies from the Maritime provinces of Canada to somewhere in South America. Byron | 
