'Field Notes:' How Scientists Study Bird Migration.
Migration is one of the many adaptations used by birds and other animals to cope with the cold temperatures and scarcity of food that winter can bring. As scientists and naturalists we are interested not only in where birds go in the winter, but in how we know where birds go in search of more hospitable conditions. Traditionally, scientists captured, tagged and released individual birds and hoped that someone, somewhere, would find this bird and report its whereabouts.
http://mtpr.org/post/field-notes-how-scientists-study-bird-migration
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