What is Haw?

HAW or nichelbate is a thin third eyelid present in many animals. It moves horizontally over the eye and reaches from the inner corner to the outside of the eye and back. When it is not used, HAW folds into the corner of the eye and is hardly visible. People had them once, but now they are permanently folded into pinkish bulbs in the inner corner of the eye. Over time, specialized use has evolved as required by each species. When sharks attack feeding, the eyes return to the head and HAW moves over the eye to protect it from threshing prey. It serves as a basic shield before injury. This also applies to the prey of birds when feeding chickens. The eyelids protect the eye from excessively zealous young people who knock on food.Haw to protect the eyes when it is under water. This type of lid is transparent and serves the same purpose as built -in glasses. The polar bear is particularly suitable for filtering ultraviolet rays to prevent blindness of snow. You could say that the polar bear has naturalized sunglasses.

mammals living between sand and sea, such as sea lion and port seal, HAW uses HAW to conflict sand and gravel from the eyes. These eyelids act as built -in windshield wipers. Lizards, crocodiles, rabbits, birds and many other animals also have HAW. In most cases it cleanses the eye, prevents it from drying and protects it from wind and dust.

While cats and dogs also have HAW, if it is constantly visible, it is usually a sign of injury or illness. The cat is white and during relaxation it is sometimes stretched halfway. However, a heartless cat with a visible haw or cat that does not resist that it should be transferred to the veterinarian without delay. Dog HAW rises almost diagonally over the eye and is dark color, although it can be reddish to infect.

HAW is a popular feature of extraterrestrials in sci -fi and gives the creation of reptilian feeling. Human volcanoes Star Trek are also attributedy The third lid in sci-fi culture.