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[61] Some species also have dual fovea. Birds are tetrachromatic, possessing ultraviolet (UV) sensitive cone cells in the eye as well as green, red and blue ones.[88] Many birds show plumage patterns in ultraviolet that are invisible to the human eye; some birds whose sexes appear similar to the naked eye are distinguished by the presence of ultraviolet reflective patches on their feathers.
[87] The avian visual system is usually highly developed.
Water birds have special flexible lenses, allowing accommodation for vision in air and water.
The nervous system is large relative to the bird's size.[61] The most developed part of the brain is the one that controls the flight-related functions, while the cerebellum coordinates movement and the cerebrum controls behaviour patterns, navigation, mating and nest building.
Most birds have a poor sense of smell[84] with notable exceptions including kiwis,[85] New World vultures[86] and tubenoses.

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