Все дети знают, что многие птицы с наступлением colds leave their native northern latitudes and go on long journeys to the south. Why is this happening? Yes, because under the thickness of snow it is more difficult to look for food, insects and ants, which you can eat in the summer, and the air temperature becomes too low. However, not all the inhabitants of the heavenly heights leave our latitudes. Which birds fly to the south, and which remain at home - we will now consider in detail.
Each bird is a representative of the fauna, and inthe same time a separate kingdom among all animals. These creations are warm-blooded, their body temperature averages 40 degrees. With the onset of severe frosts, birds begin to feel a lack of warmth, feathers and down are not enough to cope with frosts. However, this situation is not inherent in every species of this kingdom. Sparrows, magpies, crows, tits remain in their places, in temperate latitudes, since the structure of their body, the number of feathers, and also the subcutaneous fat is much higher than that of nomadic celestial inhabitants. As a result, answering the question: "Which birds fly to the south?" - we can say that, first of all, those that for physiological reasons can not cope with severe frosts. By the way, if a bird lives in a more southern region (Rostov-on-Don, Belgorod), then it does not leave its lands because of the cold. But if her homeland is Norilsk, then a flight to a more southerly region is an integral part of her life cycle.
Говоря о том, какие птицы улетают на юг, нельзя miss and the nutritional factor. Most of them are insectivorous, therefore, in winter their diet is reduced to zero. Birds that feed only on bugs and insects reach the lands where snow does not fall out at all, so that their food remains full. Among them you can distinguish finches, thrushes, jackdaws, rooks. Also actively eat insects oatmeal, devils, zoryanki. Also, arguing about which birds fly south due to a lack of food they are accustomed to, you can not miss the swallows. They are in the summer able to eat such large insects as dragonflies, May beetles and their like right on the fly. In winter, they are unrealistic to meet in our latitudes.
With the first cold weather our country is left with the mostheat-loving inhabitants of the sky. Among them we distinguish swallows, rooks, starlings, chizhev, oatkins, cranes, thrushes, larks. Of course, in the warm countries such big birds as herons, cranes, storks, ducks, swans, hoopoes, wild geese, orogs and cuckoos leave as well. The reason for the flight of these birds is the lack of food, in particular, hibernate or die all the insects that lived in the summer. They are the first of all migratory birds fly to the southern regions and the latter return to their homeland. That's why swallows can be seen on the street only since April. And wild swans return to their lakes no earlier than May.
When the cold has already taken hold, our poultry regioncan leave only if the frost is too strong, or food such as crumbs, grains, seeds will not be on the streets at all. Often in the warmer countries are sent tits, thrushes, woodpeckers, sometimes our land is left by bullfinches. Such inhabitants of the sky easily tolerate frost, so the only thing that can make them fly away is the lack of food.
