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Differential Migration Research
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In many species of birds the males and females migrate different distances from the breeding range, and thus end up partially segregated on the winter range. This may also be younger and older birds. Unraveling the potential mechanisms behind differential migration - social dominance, body size or selection for early arrival in breeding males - has been a source of fascination for ornithologists since the 1970's (with very little to show for our efforts!). I continue to think about this problem, if nothing else as an example of how knowledge is created by science.