Why do crossbills nest in winter? Detailed answer

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Why do crossbills nest in winter? Detailed answer

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Why do crossbills nest in winter?

Crossbills not only feel great in harsh winter frosts, but even breed offspring in winter.

The fact is that winter for crossbills is the most suitable time to feed offspring. After all, their chicks feed on spruce seeds, which ripen in autumn and remain in cones all winter. In March, when the scales of the cones, heated by the sun's rays, open, the seeds will fall to the ground. At this time, crossbills chicks begin to fly out of the nest, which can easily get their own food.

But in order for the chicks to fly out in March, it is necessary to lay eggs in late January - early February. That is, just in the most severe frosts.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

How, according to the views of the Pelasgians, did the universe come into being?

According to the religious ideas of the Pelasgians (the most ancient population of Greece), at the beginning of creation, Eurynome, the goddess of all things, rose from Chaos.

First of all, she separated the sky from the sea, and then, dancing over the waves, she caught and squeezed the wind in her palms - and the great serpent Ophion appeared in front of her. Eurynome danced more and more furiously, until a desire arose in Ophion, and he impregnated the goddess. Then she turned into a dove and, after the allotted time, laid the World Egg. Ophion turned seven times around this egg and hatched it until it split and everything that exists in the world appeared from it: the sun, the moon, planets, stars, the earth and its mountains, rivers, trees, grasses and living beings.

Eurynome and Ophion settled on Olympus, but then ceded it to Kronos and Rhea and were thrown into the depths of the Ocean.

Some say that Ophion offended Euryne by declaring himself the creator of the universe. For this, the goddess hit the snake with her heel on the head, knocked out all his teeth and banished him to the gloomy underground caves of Tartarus.

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Long-term use of ibuprofen is dangerous for men 23.02.2018

Few pills we take as often as painkillers. Therefore, of course, I would like to know how they still act on the body - in addition to relieving pain. In this sense, the study of employees of the University of Copenhagen and their colleagues from Denmark and France about ibuprofen seems rather disappointing: it turned out that it has a bad effect on the male endocrine system.

The experiment involved several dozen young men aged 18 to 35 years, who were randomly divided into two groups: one was given 44 mg of ibuprofen for 600 days, the other took a placebo dummy for the same period. All this time, the level of luteinizing hormone (lutropin), which enters the blood from the pituitary gland, was measured in the experimental subjects. The work of the reproductive system depends on the luteinizing hormone: in women it stimulates the synthesis of estrogen in the ovaries, in men it stimulates the synthesis of testosterone in the testes. If a man’s testosterone becomes low, the pituitary gland tries to compensate for the lack and releases more luteinizing hormone into the blood. So, if we see that its level is increased, then something is wrong with testosterone.

In men who took ibuprofen, after two weeks, the level of lutropin increased. Generally speaking, this situation is quite normal for older men, whose testosterone activity of the testes gradually decreases. The participants in the experiment, judging by the hormones, were about seventy, but in fact they were young people.

The researchers even managed to take tissue samples from the testes of men after ibuprofen - however, it’s worth mentioning right away that in this case, samples were taken from people who were in a coma. So it was possible to find out that the painkiller suppresses the synthesis of testosterone directly in the testicles.

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