dragonflies

Question

today, for the first time, I saw outside my front door, dragonflies swirling and swirling for about 15=30 minutes and then left. Even the girl across the street was trying to take pictures of it in wonderment. Where did they come from and why? and where did they go?

Answer 1

Swarms of Dragonflies could be migrating or even feeding in large groups.

https://www.gardeningknowhow.com/garden-how-to/beneficial/attracting-dragonflies.htm