They are not moble Dianna, they are attached to the limb like a cocoon would be. They start as a little brown spot, the grow.. the brown spot gets bigger and almost looks like a head and the white grows from underneath and looks as if you pushed on it it would give like cotton, though I've never tried it. You can see the little filaments where they are attached if you look real hard on the bigger ones. Or I can, not sure you can in the photo, it's not quite clear enough.