When a bird migrates it is moving to a warmer spot in the world. How does it help them survive? well the temperature decreases in the winter dropping below zero, therefore not making the cold places a suitable place for the birds to live in. When they migrate they fly to some where closer to the equator where it is the hottest like Mexico. If exposed to the winters coldness for to long, the birds temperature will drop not giving the birds the right amount of body heat needed to survive. how those birds know when to migrate i assume the sudden drop in temperature gives them a hint that if they don't get a move on they're going to freeze.
No!
Turkeys are not migrating birds because they can not fly ant have enough fat in their bodys to survive the winter.
stork
Migrating
Local flora and fauna
birds are in a v shape.
Migrating birds normally do so on an annual basis. They fly somewhere to nest and raise a family, then fly back afterwards.
bird of paradise
Local flora and fauna
so they can stay warm for the winter.
feathers.
Migrating toward warming weather is a bird's response to cold weather, while a wolf growing a thicker coat is adaptation.