shubbabang:

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Spiders balloon. Newly-hatched babies, or small ones that need to leave the area, climb up to a high place and release several long, thin strands of silk into the air, which allow them to float on the wind, attached to that silk. Sometimes they let go of it after they land, and that’s what you encounter. 
(or sometimes a spider is attached. yeah, spiders can glide. sorry.)