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Edited on Mon Jul-04-05 06:49 PM by amazona
Hummingbird migration is...complicated.
Many hummingbirds breed in the western United States and they migrate east for the winter, usually to the Gulf Coast, but especially the Rufous Hummingbird can be seen unexpectedly anywhere in the east in the winter. Even such northerly places as Michigan and Manhattan have hosted winter hummingbirds.
Calliope is quietly expanding their winter range as well and is now accepted on the Louisiana bird list. I myself discovered a wintering Calliope in my own backyard. They are not way common but they are not rare visitors as was once believed.
Ruby-throated Hummingbirds usually follow the pattern you describe, but individuals are not above staying all winter if they feel like it. It used to be that we casually checked off all winter hummers of that type as Black-Chinned, but now we have expert hummingbirders who band the birds, examine the birds at close range, and take proper measurements, and it turns out that not all Ruby-Throats migrate. It seems to me that some Ruby-Throats mill around a bit, rather than migrating in a purposeful fashion. Yet I have been on Grand Isle and seen them coming in and landing in huge numbers in the oaks in a fall-out.
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