Here is an item from a friend in Pennsylvannia re: hummers.

Sue Wetmore
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> Apparently hummingbirds do hang upside down!!  Check out the report below >>>
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> -On 8/23, at Blooming Glen, a Ruby-throated Hummingbird was seen 
> hanging upside down from a branch as another was hovering around it 
> and poking at it non-aggressively. This lasted for several minutes 
> until the hovering bird flew off to a feeder and finally the hanging 
> bird flew off. Arlene Koch suggested the hanging bird was in a 
> defensive position or was a juv. just being a kid! 
> 
> The Peace Valley Nature Center bird walk is held each Sat. 7-9 AM 
> meeting at the PVNC parking lot. All are welcome.
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