NICOLAS REUSENS / SCIENCE PHOTO LIBRARY NICOLAS REUSENS / SCIENCE PHOTO LIBRARY
Fruit fly (Tephritis postica) head. Each compound eye (green) is made up of numerous simple eyes called ommatidia. Each ommatidium sends a signal to the fly's brain, which combines the thousands of images to form a mosaic view of the world. The image is not sharp but is excellent at detecting movement.
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