I don't have many hummingbirds, only 2 recently.  However, the 2 I see 
now are very different.  One is tiny and slender, a prototypical bright 
green/white adult female.  The other is much larger, rather pot-bellied 
(maybe as much as twice the weight), and rather dull green in color. 
Its throat and breast have no real white, but instead are off-white or 
very light gray.  It doesn't appear to have any markings on the throat 
as would a young male, and I can't see much white at the tip of the 
tail, if any.  I don't know anything about the immature HBs - the 
females are hard enough for me.  Can anybody tell me what this second 
bird is?  I assume it's Ruby-throated, but don't understand the size 
difference or the color scheme.

Thanks,
	Bob Hartman