Migratory birds travel to far-away places once every year mainly because:
AThey are forced to migrate by humans
BThey get bored in one place
CThey cannot fly long distances all year
DTheir natural habitat becomes very cold or hostile in winter, and they fly to warmer regions to find food and to breed
Answer & Solution
Correct answer: D. Their natural habitat becomes very cold or hostile in winter, and they fly to warmer regions to find food and to breed
Migration is primarily a response to climate. As winter approaches, food becomes scarce and temperatures drop in the bird's native range, so they fly to warmer regions (often thousands of kilometres) — to find food and to lay eggs in milder conditions. They return when their original habitat becomes hospitable again.
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