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19 March 2005. Bluebeard
is heading home, and off to a bit of a late start. Some Ospreys return to
Martha's Vineyard around the time he began his return trip. It almost
seems that he got wind of how tough the winter was back home and
decided to wait a bit for the weather up north to lighten up. I'm being
facetious here, of course, but there are many questions about migration
that remain unanswered. One of the great mysteries is how birds
decide when it's time to return to the breeding grounds? Changes in
daylength, the cue for starting the southward migration, doesn't seem to
make sense for a bird like an Osprey because some birds winter north of
the equator and some south of it. So, for some birds, when it's time to
fly north the day will be getting longer as spring approaches (north of
the equator), while for those south of the equator the day will be getting
shorter.
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