by 
brainie
ANSWERS: 8
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Because there is more food, and less cold.
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Because it is faster than walking.
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Cos its warmer in winter
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too far to walk...
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They don't always fly south, some fly north. Housemartins fly from Africa to My House every summer and I live in the North of England.
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To escape the cold weather in the north and because they usually lose their food supply once winter sets in.
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To get to the other side
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You certainly know that while it is summer in the Northern Hemisphere it is Winter in the Southern Hemisphere. The flocks of birds fly towards the warmer climates to obtain food and to multiply, in this particular case the birds fly towards the North. While it is cold (winter)in the Northern Hemisphere it is hot (summer) in the Southern Hemisphere. The birds fly towards the South for the same purposes mentioned above. These are called migrating bird species, reason why a certain rare species from Brazil may be found in the USA during summer. This migration begins before Spring where it will be hot. Regards.
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