ID this nocturnal hitchhiker

[born]

Theres this weird hitchhiker that comes out at night out of this point in my rock.
He comes from this white tip that kinda erects outta the point of the rock outta a white tip during night time. And every couple seconds he'll kind of bring up and open his "fan" almost like a feather duster does, but imagine its only HALF of the tail (like a feather duster but split in half) then once he brings it up and open and he'll kind of scoop it back in repeating this over and over.

sorry for the bad pictures but its hard to capture this guy. His color is like a really light white, perhaps pretty much clear.