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  2. Bird - Wikipedia

    en.wikipedia.org/wiki/Bird

    The nictitating membrane also covers the eye and acts as a contact lens in many aquatic birds. [77] The bird retina has a fan shaped blood supply system called the pecten. [77] Eyes of most birds are large, not very round and capable of only limited movement in the orbits, [77] typically 10–20°. [122]

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