MacroPhotography by iwancoiy - Eye Flies

Flies have more than 4,000 lenses per eye (Flies only have 2 eyes). However, flies can not see well. Their visual power is very poor in recognizing color, but it is very good at detecting motion. That's why flies are so hard to catch and hit. If you want to hit him, it's better to start with slow motion. They tend to ignore it rather than rapidly.

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@iwancoiy