Before the onset of cold weather many species of bird living in northern and midlatitudes, go to a long way to the South. Ducks, swallows, thrushes, cranes fly to a wintering to warm regions, for example. For what reason they are let in such long and dangerous trip?
It would seem, the answer very simple: because of the future cold weather. But many birds do not fly away on the South. For example, ubiquitous titmouses, crows, pigeons, sparrows remain on a wintering in the same place where live. Perhaps they have more dense plumage and therefore they suffer from cold less. These birds learned to live near the person and to find livelihood on dumps, garbage cans. Any trash can for them – a food source. And here for those birds who eat insects, larvae, fish to remain for the winter in the same place equivalently death for hunger: insects till spring will not be, reservoirs are covered with ice. Here it is also necessary to fly to warm regions for many hundreds, and even thousands, kilometers. For example, swallows depart to winter to the region of the Mediterranean coast, and some of their types – further away, to Africa. All the known cuckoo also winters in Africa, and in its southern regions. This is the real traveler. However, do not lag behind her a flycatcher and an oriole which winter in the south of the African continent too. And here starlings mainly depart to winter on the West of Europe, to France. Ducks wild ducks winter on the coasts of the Northern and Mediterranean seas and also partially in the Balkans and in the same Africa. Cranes mostly fly away to Greece, the Southern Italy. Lebedi-klikuny winter, mainly, on the Mediterranean coast, and a smaller part – in Germany, France, Great Britain, Ireland. Many species of seagulls winter on the coast of the Azov, Black and Caspian Sea, in Central Asia, certain individuals reach India, Pakistan, the southern regions of China, even Japan. Generally, answering a question where birds fly away, most correct, will be to tell: "There, where they will find for themselves the most optimal, comfortable conditions. It is favorable weather, a good food supply, rather safe conditions of a wintering, etc." there is a lot of factors.