Doesn't everyone? :lol: Nah, I think the flies must have been intoxicated because I returned to this flower a few times attempting to get a decent photo. Although this one isn't decent exposure wise, I had to remove the Sto Fen diffuser and hit the flower with full flash simply to get enough light in to expose the dark colored flies. The flower was in REALLY deep shade. Rather contrasty to say the least. Likely took a dozen shots as the flies were slowly moving around then all of a sudden I see the arrangement shown in the photo. I thought that at least the symmetry warranted sending the pic, even with the many things wrong with it.
If you are interested in what you are seeing then read on. If not skip this post.
These flies have followed the nectar lines to the place that the nectar resides. The nectar lines are the darker ones and they absorb ultra-violet light. These, as well as most other insects, see at this wavelength and consequently the lines look like highways to heaven. The rest of the petal reflects the UV. light and this makes the lines stand out even more. These lines can be seen from the back of the flower and AT NIGHT, so the insects are guided to the nectar regardless of the time of day.
Take a close look at the flowers in your garden or those growing wild, and you will be amazed at the variety and design of these lines within flowering plants. I especially like those that are associated with Foxgloves. They are designed like footprints in the snow. I hope to take some pictures of these this year and tell you about this remarkable flower that CHANGES SEX AS IT GETS OLDER and or becomes impregnated by a bumble bee.