That is something a swift chicks don't have to do. Mum and dad clean their nest and its surroundings. There goes a lot in th emouth of these little swifts but also there comes a lot out... And what happens with that? Right! Mum and dad eat it away and take it out of the nest. That way the room under my rooftiles is kept clean. There are swifts here for years and years but it never gets real messy under my rooftiles.