On the other hand, male fruit flies are attracted to some wild orchids which do not produce nectar. Instead, they produce a precursor of the fly's sex pheromone. Flies which normally visit dead animals or dung are attracted to flowers that mimic these smelly items. They get no reward and would quickly leave, but the plant may have traps to slow them down. These plants have a strong, unpleasant odor, and are brown or orange in colour.