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Birds see see magnetic fields

20.07.2019

Scientists have put forward an unexpected hypothesis that explains why birds do not go astray during migrations. Perhaps they have the ability to see the Earth's magnetic fields.

Supervision to birds is provided by a special protein. Ornithologists made this conclusion after two studies - one was devoted to robins, the other to finches.

The protein is called Cry4 and belongs to the class of cryptochromes, which are responsible for the ability to recognize blue and ultraviolet colors and affect the regulation of circadian rhythms. They are found not only in animals and birds, but also in plants.

Recent scientific discoveries have shown that this protein may also be associated with magnetoreception - the ability to feel the planet's magnetic field.

It is known that birds can sense magnetic fields only in the presence of light waves of a certain length. According to a new theory, blue may play a major role in this process.

Scientists from Lund University (Sweden) investigated the amount of cryptochromes Cry1, Cry2 and Cry4 in the brain, muscles and eyes of finches. It turned out that the level of the first two fluctuates daily, and the last is stable. The experts concluded that it was he who was responsible for magnetoreception. The study of finches gave a similar result.

In addition, it turned out that Cry4 is clustered in an area of the retina that receives a lot of light. The scientists also found that migratory birds have much more of this protein than those who live in the same region all year round.

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The timing and quality of sleep varies by gender. 05.09.2020

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