Each summer evening, from dusk till about an hour after sunset, my yard is full of them. By late afternoon, if you look along and underside of folliage adjacent to open areas you can find them ready for the evening. They have a little dance, the steps of which aren't followed too closely. Let's see if I can remember it. They stay about 40 cm of the ground and fly up to about 2 meters up. After reaching the apex of their flight they flash their butts, and then proceed downward and slightly forward in a jerking stair-step pattern. The entire time flashing a repeated sequence of flashes the same color as a yellow glow stick. They so this from late spring through summer.