I believe the jury is still out on what birds can and cannot do.
Certainly they can navigate to a destination without relying solely on
visual cues, but whether this is magnetic sensing (as some researchers
affirm) or not remains unproven. "attitude flying" is of course a diffent
question - can they stay upright in cloud?

Almost thirty years ago I went to school with a chap who discovered
magnetite in the brains of birds, and speculated that it was used in
navigation. He did a lot of research on it (I think it was his thesis).
I haven't followed the research closely, but I think he pretty much
established it.

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain." (chapter 10 of book 3 - Harry Potter).
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