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Why is the spring bird singing next to the note?

The explanation lies in the brain. The physiological singing error of the singing birds in the Northern Hemisphere follows the cycle of the year.
In the winter, the tide is shallow, because the birds have no need to attract the spouse and not fight the circle.
The increase in light in the spring triggers the singing and is supported by changes in the brain.

Studies have found that the so-called singing mist of the songbird's brain is losing ground for the winter. In the spring, the nucleus begins to grow again, because the vocal skills are again in use. New brain cells are formed in the macula, and its neural connections are strengthened.
For example, the cheerful singing song of tsip-tsit-tsist tsittidia may still be in the early spring or otherwise sounds atypical. The situation will be corrected when the song of the song goes back. Brain changes begin as soon as the first strokes reach the air.
The dwarf dogs arrive at their nesting places before the females so that they can capture the best circles before the pairing begins. Peipot learns a typical song from his ears and his parents, but is also governed by hereditary factors. That's why young dogs, for example, are able to sing quite correctly, even if they never heard the sound of other finches.

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