[TN-Bird] Late Wave of Hummingbirds

We're wondering if others have shared our experience with Ruby-throated 
Hummingbirds this year.  Our first little group of 5-6 arrived the first week 
of April.  Last week another larger group of about 30 showed up at the feeders. 
We've never had such a huge time differential in our five years at this 
location.  Has this been a pattern this year?  If so, does anyone have an 
explanation other than the catch-all blame on global warming?
Tommy & Virginia Curtis
Smithville, TN
DeKalb County
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