These are some spiders ballooning their way around my house today while I was doing some stuff outside. Apparently they will climb up as high as possible, then let these streamers of silk fly, wait for the wind to catch hold, then go for a ride! They were good size spiders too, about 2-3 mm. Bigger than you’d think could fly this way. There must have been hundreds of them in the air, up to 100 feet or higher. I really couldn’t tell from the ground, but they were up there, with the sun highlighting the silk. Cool stuff! Mary wasn’t as appreciative though.