There are two types of fly pollination: myophily and sapromyophily. A diversity of flies (particularly bee flies (Bombyliidae), hover flies (Syrphidae), etc.) feed on nectar and pollen as adults, and regularly visit flowers. These are the myophiles. Sapromyophiles, on the other hand, normally visit dead animals or dung. They are attracted to flowers that mimic these odoriferous items! They obtain 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 color. They are not as common as myophilous plants. Myophilous plants do not tend to have a strong scent, and tend to be purple, violet, blue, and white, open dishes, or tubes.
Flies tend to be important pollinators in high-altitude and high-latitude systems, where they are numerous and other insect groups may be lacking.
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