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: birding-aus-request@vicnet.net.au http://birding-aus.org ===============================
Dave, With regards to navigating towards/ away from a pole,I would think that the question is how do the small, <400 angstrom, crystals of magnetite in the brain react to magnetic lines force. as force are horizontal and for all practical purposes parallel at equator i don't see how crossing would pose a problem navigation. i love some more information on this form navigation if someone has recent findings share. regards, alan gillanders alan's wildlife tours 2 mather road yungaburra 4884 phone 07 4095 3784 mobile 0408 953 786 http:> wrote: =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org =============================== —– No virus found in this message. Checked by AVG – http://www.avg.com Version: 2014.0.4259 / Virus Database: 3629/6876 – Release Date: 11/28/13 =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org ===============================
Your pc might be infected by the Clive Palmer virus. Carl Clifford =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org ===============================
Well there you go, I type magnet and the autocorrect turns into something else, cheers Jeff. —–Original Message—– Sent: Friday, 29 November 2013 2:42 PM Cc: ‘birding-aus@vicnet.net.au‘ Vagrant is probably an over strong term for these recently recorded migrants reported on Ashmore, except for the Willow Warbler which should have been geographically somewhere much further west. I would expect them all to survive and complete a migration back to their respective breeding locations. Most of these birds migrate into the Sundas, so Ashmore isn’t really that big a step when compared to the total migration distance. I wonder how many of these lob into the Kimberley every season and go un-noticed in the vastness of the landscape. The birds are easier to find on Ashmore because it is tiny and acts as a magnate to any birds wandering south of the Sundas, same as Christmas and Cocos Islands. Increased trips to Ashmore, Christmas and Cocos are revealing many of these species to be “annual vagrants!!”, all of them should be considered potential for NW Australia. Cheers Jeff. —–Original Message—– [mailto:birding-aus-bounces@lists.vicnet.net.au] On Behalf Of Clive Nealon Sent: Friday, 29 November 2013 1:51 PM Cc: birding-aus@vicnet.net.au The Willow Warbler from Europe is a regular and abundant migrant to southern Africa each year, so distance would not seem to present a problem. Regards, Clive. —–Original Message—– Cc: Birding-Aus Aus < birding-aus@vicnet.net.au> Sent: Fri, Nov 29, 2013 9:45 am I wondered about that last night as well, particularly on thinking about the Willow Warbler which is so small that you wonder how it could have got there in the first place! Sonja On 29/11/2013, at 12:32 PM, Carl Clifford < carlsclifford@gmail.com> wrote: 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. =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org =============================== =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org =============================== =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org ===============================
Vagrant is probably an over strong term for these recently recorded migrants reported on Ashmore, except for the Willow Warbler which should have been geographically somewhere much further west. I would expect them all to survive and complete a migration back to their respective breeding locations. Most of these birds migrate into the Sundas, so Ashmore isn’t really that big a step when compared to the total migration distance. I wonder how many of these lob into the Kimberley every season and go un-noticed in the vastness of the landscape. The birds are easier to find on Ashmore because it is tiny and acts as a magnate to any birds wandering south of the Sundas, same as Christmas and Cocos Islands. Increased trips to Ashmore, Christmas and Cocos are revealing many of these species to be “annual vagrants!!”, all of them should be considered potential for NW Australia. Cheers Jeff. —–Original Message—– [mailto:birding-aus-bounces@lists.vicnet.net.au] On Behalf Of Clive Nealon Sent: Friday, 29 November 2013 1:51 PM Cc: birding-aus@vicnet.net.au The Willow Warbler from Europe is a regular and abundant migrant to southern Africa each year, so distance would not seem to present a problem. Regards, Clive. —–Original Message—– Cc: Birding-Aus Aus < birding-aus@vicnet.net.au> Sent: Fri, Nov 29, 2013 9:45 am I wondered about that last night as well, particularly on thinking about the Willow Warbler which is so small that you wonder how it could have got there in the first place! Sonja On 29/11/2013, at 12:32 PM, Carl Clifford < carlsclifford@gmail.com> wrote: 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. =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org =============================== =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org =============================== =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org ===============================
The Willow Warbler from Europe is a regular and abundant migrant to southern Africa each year, so distance would not seem to present a problem. Regards, Clive. —–Original Message—– Cc: Birding-Aus Aus < birding-aus@vicnet.net.au> Sent: Fri, Nov 29, 2013 9:45 am I wondered about that last night as well, particularly on thinking about the Willow Warbler which is so small that you wonder how it could have got there in the first place! Sonja On 29/11/2013, at 12:32 PM, Carl Clifford < carlsclifford@gmail.com> wrote: 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. =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org =============================== =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org ===============================
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 < davidtorr@gmail.com> wrote: =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org ===============================
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 < carlsclifford@gmail.com> wrote: =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org ===============================
I wondered about that last night as well, particularly on thinking about the Willow Warbler which is so small that you wonder how it could have got there in the first place! Sonja On 29/11/2013, at 12:32 PM, Carl Clifford < carlsclifford@gmail.com> wrote: =============================== To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) http://birding-aus.org ===============================