Why do birds fly back to their nest in the evening?

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Varshini M.r

Physics Teacher

Birds can't see the objects clearly in night times due to the absence of rod cells so they are back to fly their nests
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Majority of birds lack rod cells, which is responsible for night vision, so due to the absence of these cells they cannot see the objects clearly in less or dim light. This is the reason why birds fly back to their nest in the evening.
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This has been proved by letting birds fly in a planetarium and changing the stars' position. Another tool is the earth's magnetic field (earth's north and south magnetic poles). Some birds, like pigeons, have a small zone in their brain made of magnetite (magnetic mineral), just like a small compass...
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Birds start their day by going to different directions in search for food or small woods ticks for food or shelter, at evening they return their nest to feed their children and to protect them from owls and eagles
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Retinal is a component of the visual pigments of Rod and cone cells. Rhodopsin, the visual pigment of the Rod cells in the retina, consist of 11-cis retinal specifically bound to the protein opsin. In the dark, retinal of rhodopsin is in 11-cis form. When rhodopsin is exposed to light, 11-cis retinal...
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Retinal is a component of the visual pigments of Rod and cone cells. Rhodopsin, the visual pigment of the Rod cells in the retina, consist of 11-cis retinal specifically bound to the protein opsin. In the dark, retinal of rhodopsin is in 11-cis form. When rhodopsin is exposed to light, 11-cis retinal undergoes a series of photochemical reactions that converts it to all trans retinal and release of all trans retinal and opsin. Birds lack Rod cell. It is responsible for night vision. Absence of Rod cells, they can't see object properly at night. So, Birds fly back to the nest in the evening. read less
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