Avian eyes are peculiar due to presence of

Sensitive retina

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Large pupil

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Large number cones

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Pecten oculi

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Solution

The correct option is D Pecten oculi
The avian visual system is usually highly developed. Birds are tetrachromatic, possessing UV-sensitive cone cells in the eye as well as green, red and blue ones. The bird's retina has a fan shaped blood supply system called the pecten. It is a comb-like structure of blood vessels belonging to the choroid in the eye of a bird.
Thus, the correct answer is (D), Pecten.

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