How would that work for Double-banded Plovers and southern seabirds trying to
find the same island they were born on to breed after hower many years at sea
before they become mature, I wonder?
Sonja
On 29/11/2013, at 12:48 PM, Dave Torr <> wrote:
> 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
>> ===============================
>>
>> To unsubscribe from this mailing list,
>> send the message:
>> unsubscribe
>> (in the body of the message, with no Subject line)
>> to:
>>
>> http://birding-aus.org
>> ===============================
>>
> ===============================
>
> To unsubscribe from this mailing list,
> send the message:
> unsubscribe
> (in the body of the message, with no Subject line)
> to:
>
> http://birding-aus.org
> ===============================
===============================
To unsubscribe from this mailing list,
send the message:
unsubscribe
(in the body of the message, with no Subject line)
to:
http://birding-aus.org
===============================
|
