Earlier this year I took a Danish guy out birding - turns out he was a
Professor of Ornithology in Germany. His speciality was migration and - if
I understand correctly - his research shows that birds can basically find
their way towards a pole or away from a pole, and not necessarily north or
south. (This would seem OK for birds that migrate solely within a
hemisphere but seems difficult to apply to our waders for example?). So he
reckoned that once a bird had crossed the equator - and we were talking
about the fairly regular male Northern Shoveller at Werribee - it would
continue its annual migration pattern but be out by 180 degrees - which
would work reasonably well in such cases. But harder to apply to birds
which just make it over the equator I guess
On 29 November 2013 12:32, Carl Clifford <> wrote:
> I thought struck me the other day (yes, it was painful). What happens to
> the vagrant species that turn up at places such as Ashmore Reef or
> Christmas/Cocos Is.? Do they all die? Having arrived at these places due to
> weather conditions or navigational error, many, if not all, would certainly
> have problems re-orienting themselves, so I imagine that the chances of
> returning to their normal habitat would be fairly slim. I imagine that such
> places, particularly Ashmore, would be rather like an avian death row.
>
> Carl Clifford
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