English: Peacock mantis shrimp (Odontodactylus scyllaru). The mantis shrimp has one of the most elaborate visual systems ever discovered. Compared to the three types of color-receptive cones that humans possess in their eyes, the eyes of a mantis shrimp carry 16 types of color receptive cones. Furthermore, some of these shrimp can tune the sensitivity of their long-wavelength vision to adapt to their environment. The mid-band region of its eye is made up of six rows of specialized ommatidia—a cluster of photo-receptor cells 12 for color sensitivity, 4 for color filtering. The vision of the mantis shrimp can perceive both polarized light and multi-spectral images. Their eyes mounted on mobile stalks and capable of moving independently of each other are similarly variably colored and are considered to be the most complex eyes in the animal kingdom.
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