Hummingbirds fattening-up

Photos by BarrytheBirder

Today is September 2.   I expect my backyard Ruby-throated Hummingbirds to stay around for another three weeks and then all leave on the same day for sunny climes south.   Weather forecasts say that September may be especially warm and I'm wondering if the hummers might hang-on to the end of the month.   They're more than welcome to do exactly that, if they wish.   Meanwhile, over the past two months, the bellies of first-fall juveniles have gone from being the size of my little finger to the size of my thumb. 

Please comment if you wish.

BtheB