Why do birds migrate?

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A royal flycatcher shows his stuff. This homebody is content to stay put in Costa Rica year-round. Credit: Copyright 2004 Alice Boyle
A royal flycatcher shows his stuff. This homebody is content to stay put in Costa Rica year-round. Credit: Copyright 2004 Alice Boyle

Why do some birds fly thousands of miles back and forth between breeding and non-breeding areas every year whereas others never travel at all?


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All News summaries for March 01, 2007

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1 hour ago | User rating: not rated yet
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