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There is much more to say about a budgie's eye. Humans and most mammals have two lids which can be opened and closed from above downwards (in vertical direction). In addition to their upper eyelid (1c) and lower eyelid (1d), birds possess a third, inner lid, the so-called nictitating membrane (1e), see photo on the right. This transparent membrane protects the eye and while it is in its rest position it is located in the front portion of the bird's eye. The nictitating membrane opens and closes from the upper front section to the lower rear section (diagonally).
And a bird's eye shows another detail that can be compared to a quite similar human body part: On the edges of the upper and lower eyelids there are some tiny hair-like feathers (1f). They are comparable to the human eyelashes and can only be seen from very close. A bird's eyelashes protect the eye from dirt. The photo on the right shows the lashes of a budgie. This particular bird has very dense "eyelashes".
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