G'morning David,

 -> Not hovering in a breeze which pushes them back, 
 -> but controlled flight backwards in still air.

 DW> Yes. That's what I mean. I'm sure many birds can 
 DW> do it, at least for short distances. The question 
 DW> is, can they see where they're going?

Observation suggests bird rely as much on the back-to-back
positioning of eyes as on physical re-positioning of the
head to scan the environment.  Anybody seen a bird whose
eyes roll in the head ?

:-)

 
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