Bird migration is a regular seasonal voyage that many species of birds make in response to the decline in food and shelter resources due to seasonal changes. The main reason for migration or movement – food; for example, some birds may refuse to migrate if fed during colder months. Changes in day length are a sign of migration and are associated with hormonal changes in birds. Birds will also show anxiety and increase fat deposition. The shorter days of autumn the birds return to warmer places, where will find an ample supply of food. Benefits of migration / movement of birds outweigh the great physical effort and other travel risks. Many small insect-eating birds migrate long distances and usually at night. They can feed for several days before continuing on their journey. The advantage of night migration is that it minimizes the threat from predators by allowing birds to feed during the day and preventing overheating.
The navigation for this passage of عظم الهدهد is based on several different senses. Many birds use the sun as a compass, which suggests time compensation. The ability to detect magnetic fields, the use of visual cues and your sense of smell are used to aid navigation during migration. Bird migration is a strong genetic component in terms of timing and route that can be influenced by environmental changes. The most critical factors are the climatic wind direction, and temperature extremes. Migratory birds can use two tools to find their destination: innate (genetically programmed) and experienced. The first migrant flies according to the Earth’s magnetic field, but does not know how long it will take until he is used to traveling and can use his other abilities.
Migration is mainly observed in the northern hemisphere and less evident in the southern hemisphere. This is due to the absence of significant climatic changes and the constant supply of food to birds. No two species can follow an exact route from start to finish. Migrations boil down to one or more preferred routes, or often referred to as “migration routes”. Migration routes are mainly along the coast, sometimes on the rivers or mountain ranges, and can use updrafts and other wind or avoid obstacles such as large areas of open water, and may vary during the return migration. There are four main Flyways of North America: Atlantic, Mississippi, Central and Pacific. Migration routes are not defined within their borders and can sometimes merge into one.
As this phenomenon can affect?
Migrant workers are scattered far as young birds and form a connection with potential breeding grounds and wintering. Once the attachment to the site is complete, the birds show high attachment to the site by visiting the same sites year after year. Make sure your nest boxes are clean and accessible when these birds return to maintain the cycle of these migratory species.