They eat all sorts of flying insects and dragonflies are among some of the most common forage. I read yesterday that it takes 5 crickets to equal one dragonfly. I've seen them bring every conceivable flying insect back to the nest to feed their young, including house flies, wasps, yellow jackets and the like.

If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then will I hear from heaven and will forgive their sin and will heal their land. 2 Chronicles 7:14