Why birds are not born to get lost

Updated on society 2024-07-25
5 answers
  1. Anonymous users2024-02-13

    They rely on the distribution of the magnetic field on Earth.

  2. Anonymous users2024-02-12

    The biological clock in their body, and some turtles also have these functions.

  3. Anonymous users2024-02-11

    Sun (polarized light) + Earth's magnetic field.

  4. Anonymous users2024-02-10

    Experts have long known that birds and many other movements rely on the Earth's magnetic field to orient themselves. However, recent research has shown that birds also need to correct their sense of direction from the Earth's magnetic field based on the natural polarization of sunlight.

    The experimental results of Dr. Kenneth and his wife in the United States show that the Savannah sparrow can not only see the polarization form in the sky during the day, but also can use this wide excavation vibration form as a tool to pave civil aviation and correct the sense of direction of the magnetic field.

    During the experiment, the Abel couple kept the sparrows in cages and outside the house, and when it was time to migrate south, the birds looked agitated and facing south. In some experiments, an electromagnetic field around the cage was activated, shifting the direction of the magnetic field felt by the sparrow by 90 degrees. In this way, the north pole of the artificial magnetic field will point the compass in the birdcage to the west.

    Then place a clear plastic sheet over the cage. So that the sparrows in the cage do not feel the polarization of sunlight. At this time, the sparrows in the birdcage show the intention to fly westward in the environment of the artificial magnetic field, ignoring the direction indicated by the daylight.

    But as soon as the plastic plate that blocks the polarized light is removed, the sparrow no longer cares about the direction of the man-made wrong magnetic field, and re-identifies the direction due south according to the natural polarization form of sunlight.

    Birds are not only able to discern their way on long migrations, but they also never get lost during their short flights homecoming. Biology experts believe that bird migration and homing may depend on two different path-finding skills. The results of a series of experiments have shown that by shining white, green or yellow light on the cage, the bird can easily identify the direction of return to the nest based on the Earth's magnetic field.

    However, if the red light is used to illuminate the bird's cage, the beautiful bird loses the ability to feel the earth's magnetic field, and flies around, unable to distinguish the direction. Dr. Riske argues that at least for some species of birds, visible light on the retina causes electrons in a pigment called rhodopsin to become active, and rhodopsin, which is essential for vision, and if a part of the electrons in rhodopsin is active, rhodopsin will produce anterograde field magnetism and is therefore affected by the magnetic field.

  5. Anonymous users2024-02-09

    Some scientists believe that birds identify and determine their migration routes by sight, based on topography, features and food. Some scientists believe that birds use the position of the sun to identify the direction of migration during the day, and the position of the stars to determine the direction of flight at night. Some scientists believe that the migration routes of birds are determined by the birds' induction of the Earth's magnetic field.

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