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In addition to the two eyelids usually found in vertebrates, bird's eyes are protected by a third transparent movable membrane. The eye's internal anatomy is similar to that of other vertebrates, but has a structure, the pecten oculi, unique to birds. Some bird groups have specific modifications to their visual system linked to their way of life.
Media in category "Images of birds" The following 53 files are in this category, out of 53 total. Bul02BirdP050.jpg 1,076 × 1,368; 81 KB.
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The nictitating membrane of a masked lapwing as it closes over the left eye, originating from the medial canthus. The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus to protect and moisten it while maintaining vision.
The magnificent frigatebird (Fregata magnificens), frigate petrel [2] or man o' war [3] is a seabird of the frigatebird family Fregatidae.With a length of 89–114 centimetres (2 ft 11 in – 3 ft 9 in) and wingspan of 2.17–2.44 m (7 ft 1 in – 8 ft 0 in), it is the largest species of frigatebird.
Bird flu is a scary illness with a high mortality rate. But so far, infections in the U.S. have been relatively mild—until now. A patient in Louisiana has been hospitalized with a severe case of ...
Greta oto is a species of brush-footed butterfly and member of the subfamily Danainae, tribe Ithomiini, and subtribe Godyridina.It is known by the common name glasswing butterfly for its transparent wings, which allow it to camouflage without extensive coloration.
These birds are mainly small, stocky, woodland species with short, stout bills. Some have crests. They range in length from 10 to 22 cm (3.9 to 8.7 in). They are adaptable birds, with a mixed diet including seeds and insects. [3] Many species live around human habitation and come readily to bird feeders for nuts or seed, and learn to take other ...
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