[TN-Bird] Migrants and Survival of the Fattest

We too have had Summer and Scarlet Tanagers and a Baltimore Oriole.  The Ruby 
Throated Hummingbirds get more and more abundant.  They are buzzing the other 
birds and even a rabbit!  And what about "Survival of the Fattest"? They seem 
to use up so much energy fighting each other, it must take them more time to 
bulk up.  I suppose where there are natural food sources they are spread 
around more than the two or three (or more) feeders we provide, so they are 
"defending" just a few sources.    Ralph and Kay Brinkhurst  Lebanon, Wilson Co.

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