BIRDS MIGRATION.

Cuckoo & Swallow.

Birds needs an appropriate environment and enough food in the breeding season, and these two factors are essential for explaining the birds migration phenomena for most birds categories. some birds like the Swallow and the Cuckoo birds migrate during the Summer from Africa to Europe for a better weather and food conditions, then goes back to it's home Africa in Autumn.

Some northern Scandinavian area birds takes an opposite consolidated path, they migrate towards Europe in winter running from the bitter cold winter, and goes back home in the summer, when bitter cold is gone.

Geese.

So many birds categories in the world do migrate in different weather conditions according to it's food and breeding conditions in it's home areas, from continent to another or from country to another, and those who have witnessed the birds flying over their hometowns are noticing the exact dates that birds fly in fixed times during the year, as it's the way that Cat, obesity and wild geese birds in Africa.

Tern.

Birds really sometimes cross a very long distances in it's migration journey and their could be facing strong winds, storms or snow and hundreds or from it could die during their journey, but it's the almost %90 arrive their destination in safe condition. some Swallow birds crosses thousands of miles during it's migration journey, but the longer distance ever recorded by the migration journey of the Tern birds, they travel from their place of hatchery to in the end of summer in northern Canada to shores of the southern pole then they go back to north Canada in the next beginning of Summer.

Some Birds migration paths.

The birds migration phenomena had confused the biologists for decades, starting fro how the birds can find it's way and the specific destination that they reach every year and it has been the same since millions of years ago. some biologists think it could be using the sun position during the day and stars positions during the night like navigators in the ocean, and they think that this kind of knowledge has been programmed in it's brains by default.