Dragonfly head. Close-up of the head of a dragonfly (order Odonata), showing its large compound eyes (centre left and right). Each compound eye 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.
July 24th, 2016
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