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The eye-ring of a bird is a ring of tiny feathers that surrounds the orbital ring, [5] a ring of bare skin immediately surrounding a bird's eye. [5] [6] The eye-ring is often decorative, and its colour may contrast with adjoining plumage. [4] The ring of feathers is sometimes incomplete, forming an eye arc. In the absence of a conspicuous eye ...
Also defined: orbital ring. A visible ring of feathers around a bird's eye; the eye-ring is often paler than the surrounding feathers. By contrast, an orbital ring is bare skin ringing the eye. In some species, such as little ringed plover, the orbital ring may be quite conspicuous. [97] eyestripe Also, eye line / eyeline.
The scleral ring or sclerotic ring is a hardened ring of plates, often derived from bone, that is found in the eyes of many animals in several groups of vertebrates. Some species of mammals, amphibians, and crocodilians lack scleral rings. [1] The ring is in the fibrous outer layer of the eye, called the sclera.
Eye ring may refer to: Eye ring, also called a "lover's eye ring", a type of antique ring; Eye-ring, tiny feathers that surrounds the orbital ring of some birds; Periorbital dark circles, dark blemishes around the eyes. Limbal ring, a dark ring around the iris of the eye, where the sclera meets the cornea.
The skull of a normal bird usually weighs about 1% of the bird's total body weight. The eye occupies a considerable amount of the skull and is surrounded by a sclerotic eye-ring, a ring of tiny bones. This characteristic is also seen in their reptile cousins.
A small bird 11 to 13 cm in length and around 10 g in weight, it has a conspicuous ring of white feathers around its eye. There are a number of plumage variations depending on the sub-species. Generally it has olive-green wings and either a grey or olive-green back, a lighter coloured throat - yellow or grey, flanks that range from chestnut to ...
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Some individuals in the North Atlantic, known as "bridled guillemots", have a white ring around the eye extending back as a white line. This is not a distinct subspecies, but a polymorphism that becomes more common the farther north the birds breed. [18] The chicks are downy with blackish feathers on top and white below.