7. What is the scientific
reason behind the birds migration.
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2
Answer:
Bird migration is the regular seasonal movement, often north and south along a flyway, between breeding and wintering grounds. Many species of bird migrate. Migration carries high costs in predation and mortality, including from hunting by humans, and is driven primarily by availability of food.
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5
Answer:
The migration of birds are seasonal phenomenas
The birds are migrate to reproduce their young once, and to protect them from harsh climatic conditions and for food, water and shelter.
example,Siberian Crane migrate from Siberia to India in winter
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