Causes of bird migration:
Bird migration means the movement of birds from places with low food resources to places with increased food resources, in search of food or settlement and a sense of warmth and safety, as the birds of the northern hemisphere tend to migrate north in the spring to take advantage of the increase in the number of plants and the abundance of nesting sites in that area.
Birds migrate in search of food :
The main reason for the migration of birds is the scarcity of food, if birds do not migrate from tropical places, they will suffer from a lack of food, which will affect their reproduction process. for example, small songbirds migrate in the spring from the coast of Mexico and land on the coasts of the Gulf countries.
Birds migrate in search of warmth :
Climatic changes affect the migration of birds. birds leave their breeding areas in very cold and very hot regions, as they need a habitat with more moderate temperatures due to their inability to tolerate inappropriate temperatures.  for example, the mallard duck, which is characterized by its green head and Chestnut-white body, migrates from Alaska, Canada, and the northern regions of the United States to the southern regions in the cold seasons.
Birds migrate to preserve their kind :
Places with abundant food sources are characterized by attracting predators, which endangers the nests of birds where the eggs of their young are, so birds migrate to give their young an opportunity to grow in safety, so they go to places with coastal cliffs or offshore islands as it is difficult for predators to reach them there. birds also migrate due to the spread of diseases in some of their habitats, which causes the elimination of thousands of birds in a short period of time, which makes these migratory birds safe from transmitting infections to their offspring.
The reason for the migration of birds in autumn and winter :
Birds migrate from their breeding places to their migration areas in autumn and winter, for example; ducks, geese, and other water birds migrate in winter as a result of the freezing of sea and ocean waters, in search of food, warmth, and to preserve their young, and the reasons for bird migration in winter are similar to the autumn season, and among these reasons are the following:
- Lack of food
- Temperature change
- Look for a place to set up nests, as the trees lose their leaves in autumn.
The reason for the migration of V-shaped birds :
Scientists argue that the migration of birds in the form of a letter v has several reasons, such as:
Conserve their energy :
Each bird flies slightly above the bird in front of it, which leads to a reduction in wind resistance.
Flying for a long time :
This method allows birds to take turns among themselves to fly in front, even if the bird gets tired, it turns back and another bird takes its place.
Intergroup communication :
This style facilitates communication between members of the group and also tracking each other.
The most beautiful migratory birds in the world :
Here are the most prominent migratory birds, which are distinguished by their magnificent beauty:
The Siberian white crane :
This bird is characterized by its white color, migrating during the winter to India, and is a carnivorous bird that lives in Siberia and the northern parts of Russia where it breeds there, and is an endangered species.
Sparrow hawk Asian :
A small bird of Prey, but it is smaller in size compared to larger birds such as Eagles, migrates in winter to India and Myanmar and spends from 4 to 6 months there.
Dalmatian Swans :
The Dalmatian pelican is distinguished by its silvery-white color, and the red color that covers the bottom of its long pointed beak, and in winter the color of the bottom of its neck changes to yellow, and its silver color turns to Gray, and this pelican is found in Europe, Asia, and Africa.
Amur falcons :
They are small-sized predatory Falcons that breed in Siberia and migrate to South Africa in large groups across northeastern India and over the Arabian Gulf, and it is worth mentioning that they have become endangered due to the killing of thousands of them.
Eastern white stork :
The eastern white stork feeds on frogs, insects, and small birds, in addition to its distinctive white color and black wings, and is also found in China, Japan, Russia, and Korea, and is reported to be endangered.
Preferred bird migration times during the two days :
The migration times of birds during the day vary depending on their species; some birds migrate at night and others during the day, and the types of birds that prefer to migrate during the day are birds of prey, birds hunting insects, waterfowl, and sensitive.
This is due to the dependence of these birds on the warm air currents rising from the ground to lift them and help them fly and provide their own energy, and unlike those species, most songbirds prefer to migrate during the night and use the daytime period to rest and look for food in unfamiliar places, and it is believed that the stillness of the air and the low night temperature constitute optimal conditions for their flight.
Risks of bird migration :
During their migration flight, birds are exposed to many dangers, some of which can be mentioned as follows:
- Physical stress during flight.
- Lack of food supply.
- Bad weather conditions.
- Risk of predation.
- Collisions with buildings and towers.