Saturday, May 1, 2010

Point And Shoot With Fastest Lens2009

Day World Migratory Bird Day


The phenomenon of migration birds has continued to astound the human being.
already about 5000 years ago on the island of Cyprus in the Mediterranean, was associated with the seasonal movement of a large group of large birds with the right time to start planting. Aristotle
recognized the phenomenon of migration and identified several species of migratory birds.

For the Old Testament prophets hawks migrating from northern Europe to Africa through the skies over the Sinai Peninsula and the Red Sea, was a wonderful phenomenon, worthy of being referred to it symbolized God's ways .

The migration phenomenon was recognized gradually over the centuries.

How can fly such distances without getting lost or die of exhaustion?

how these complexes evolved migratory patterns?

What are the problems faced by migratory birds?

Much of the mystery has been revealed, but there is still much to discover this fascinating phenomenon. In fact, half the world's bird species migrate. However, every trip is truly unique.

What is a pattern of migration?

There are birds that migrate only a few hundred meters, while others travel the globe, some traveling from north to south, others east to west. The routes are as varied as the species of birds that undertake these amazing trips.

showing migration patterns of birds are not easy to define. The easiest to understand is perhaps the total migration, population undertaking complete certain species of birds from the northern to the southern hemisphere and vice versa. Winter is so crude in its breeding territory that they should move north into areas where food is available to survive.

In many species with total migration also exists the phenomenon of partial migration, some birds migrate population and others do not. Other
present altitudinal migration (from a low area to a higher or vice versa). Overall, bird species with special needs have developed specific migration patterns, routes and sites of particular supplies. This information is transmitted genetically from generation to generation.

When traveling?

Migration is an instinctive behavior.

Birds, like other animals, have two "biological clocks" that determine daily and annual complex functions, respectively. The daily biological clock responds to daily cycles of light and temperature. The annual clock acts on the hormonal system and announces, for example, the time to change plumage, migration, reproduction. These mechanisms are to be given the necessary physiological changes that prepare them to migrate at the right time.

Some species of birds travel at night. Others do it only during the day because they depend of hot air currents or springs, to move. And there are some migratory birds that travel without stopping or making very few stops to reach its destination.

oriented How?

birds are masters of navigation. To reach their destination must know the direction you must fly, or be oriented, and also be able to recognize the final site. To do this, use basically three compasses, the magnetic, the stars and sun. Some species also help by sense of smell, hearing and sight.

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