Why do owls are all things visible in the night?

Generally birds are not visible in the night, so it is thought that this ancient species of birds as "night blindness". The thing to know is not always blind birds at night. Owls, cauldrons, labels, ducks, storks night as the animals can see clearly at night. So why the birds could clearly see things at night?


The deepest part inside the eye of birds and other animals are high retina, where the reception of light stimuli. The retina receives light, then through the nervous system to transmit to the brain. In the retina of the animals have needle-shaped cells that receive light stuff. In general, birds like chickens at night blindness, the retina has more cells than needles, and rod cells is less. So we do not see clearly at night. The birds can see clearly at night, in the retina of the eye has many rod cells. In the fall, a small number of birds flying from Siberia through the light of stars which direction to fly over the sea to Japan. This means that birds fly at night or have more or less needle-shaped cells, they can continue to fly during the day is.
In birds eye hoes, needles cells of slightly more than a little rod cells, so the national bird can operate on a moonlit night.