Re:   << when hummingbirds drink from a feeder that's been in 
30-50 degree temps all night, it lowers their body temp so much 
that they can drop into a torpor and literally fall unconscious
to the ground.  .....  the recommendation to avoid this is >>

...  to remove the perch from the feeder, so the hummingbird
has to hover, and thus keeps its body temperature elevated.

No perch on my feeder.    
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