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The home cat has somewhat poor shade vision and only two types of cone cells, optimized for sensitivity to blue and yellowish green; its ability to differentiate between pink and green is restricted. A response to middle wavelengths from a system aside from the rod cells might be due to a third Pets news kind of cone. This seems to be an adaptation to low light levels somewhat than representing true trichromatic imaginative and prescient. Cats even have a nictitating membrane, permitting them to blink with out hindering their imaginative and prescient. Comparison of cat righting reflexes in gravity and zero gravityCats are typically fond of sitting in high places or perching.