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The common housefly is indeed... eh.... common, and an obvious insect to imitate.
What does it imitate?
It imitates a house fly, obviously.
The idea for making this fly came from nature. I tie my flies after taking a closer look at the real insects. Knowing the entomology of the insects is the key to making a good imitation of a fly. The next thing is to choose the appropriate materials.
I use it when go fly fishing for chub. Here in Bulgaria the chub (Leuciscus cephalus) is a very popular fish for fly fishing and you can find it in almost all streams and rivers in our country as well as in many lakes.
I fish the fly as a dry fly.