He wondered what was going on. Ornithologists found the stomach of one common nighthawk that contained more than 2,100 flying ants, eaten in less than a day. We looked through various literature on nighthawks and could find nothing. But we're not well-studied on dragonfly behavior. It's possible that the nighthawks happened upon a sizable, simultaneous emergence of a large number of dragonflies from some nearby stream or pond.
Dragonflies spend much of their lives as extremely ugly, underwater nymphs.
The much more famous Bird Notes, a newsletter of the Cornell Laboratory of Ornithology, has a timely suggestion. This is a great way to put the seeds from your Halloween pumpkins to good use. Some birds relish these seeds even more than black-oil sunflower. Spread them out on trays to air dry before placing them in your feeders or on the ground. If the seeds are sufficiently dry and free of mold, you can save them to use when winter comes.