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Crane flies flutter around only when absolutely necessary - when searching for mates or stirred up by a predator. As they near the end of their adult life, many are visibly tattered. This one is missing two legs. (GIF: Arlene Islas/UANews) Crane flies flutter around only when absolutely necessary - when searching for mates or stirred up by a predator. As they near the end of their adult life, many are visibly tattered. This one is missing two legs.