With what frequency does a woodpecker strike a tree trunk with its beak? Detailed answer

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With what frequency does a woodpecker strike a tree trunk with its beak? Detailed answer

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With what frequency does a woodpecker strike a tree trunk with its beak?

The record holder among the 214 species of woodpeckers known in the world in terms of the frequency of drum sounds made by beak blows to a tree trunk is one of the Californian woodpeckers.

He hits a tree with a frequency of up to 28 beats per second, his fraction resembles rather a machine gun.

Author: Kondrashov A.P.

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How to check eyesight with the help of stars?

There are many legends about Ursa Major and Ursa Minor. Here is one of them. Once upon a time, King Lycaon, who ruled the country of Arcadia, had a daughter named Callisto. Her beauty was so extraordinary that she risked competing with Hera, the goddess and wife of the almighty supreme god Zeus. The jealous Hera eventually got her revenge on Callisto by turning her into an ugly she-bear.

When the son of Callisto, young Arkad, returning from hunting, saw a wild beast at the door of his house, he nearly killed his mother. Zeus prevented this - he held Arkad's hand, and Callisto forever took him to heaven, turning into a beautiful constellation - Ursa Major. At the same time, Callisto's beloved dog was also turned into Ursa Minor. Arcade Zeus turned into the constellation Bootes, forever doomed to guard his mother in the sky. Ursa Major and Ursa Minor are non-setting constellations, most visible in the northern sky.

Next to the star Mizar (from the Arabic word for "horse") - the second, or middle, star in the handle of the Big Dipper - the star Alkor is barely noticeable (in Arabic it means "horseman", "rider"). You can check your eyesight using it: if you see the star Alcor with the naked eye, then you are fine with it.

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