BTO Cuckoo Tracking

Please note that the BTO (British Trust for Ornithology) carry out a brilliant Cuckoo tracking project.

We think that we need to be sure that we are clear how fledglings make the journey to their wintering grounds.  As they have never been there before, how do they know how to get there?

If any of your birds are fledglings the tracks recorded are a really important refutation of some of the prevailing bird navigation theories where it is proposed fledglings fly on fixed compass headings.

We also know, that adults who have made the journey before use different navigation cues to fledglings (using two eyes, not one, for navigation) and also, typically like other species the journey home is not the same as the journey down to winter.  Birds tend to dawdle on the route down to their wintering grounds stopping off for breaks and refuelling – feeding.  On the way back to breed,  they tend to go the fastest route to get the best breeding territories and mates.

Click for more fascinating data.

Richard Nissen
Editor

Posted in Bird Navigation, Cuckoo | Leave a comment

Mystery of Bird Navigation System Still Unsolved

This link is important as it gives you more information on the work done by David Keays et al, which proved that the magnetite particle array supposed to exist in the upper beak, creates a magnetic compass response mechanism for birds, does not exist.

As this article suggests the other candidate for magnetic response is a quantum effect in the cryptochromes in the birds eyes.

Richard Nissen
Editor

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Wild Dolphin “Asks” Divers to Help Free Itself from Hook

Wild Dolphin “Asks” Divers to Help Free Itself from Hook

Posted in Animal Migration, Dolphins | Leave a comment

The long Way (excerpt) by Bernard Moitessier

Bernard Moitessier sailed single handed around the world in 1969 and published his accounts of this trip in 1971 in the book “The long Way”.  This description comes from this book.

Moitessier was a very seasoned sailor when he undertook the single handed round the world challenge in 1969.  He opted out of the race to continue to travel round the world with the roaring forties.

This story finds him on 48 degrees south heading East planning to bypass the Stewart Island reefs at the southern tip of New Zealand to the South.

He tells this tale:

I hear the familiar porpoise whistling and hurry out on deck.  I find a tight line of 25 porpoises,  (more than I have ever seen at once ).  They are in a tight line swimming abreast from stern to stem on the starboard side, then in three breathes the whole group veers right and rushes off at right angles.

I watch wonderstruck, they do the same thing more than ten times.

The whole sea rings with their whistling: they are obviously obeying some precise command.  They seem nervous too, as they are not playing with the bow wave as they usually do.

Something pulls me, something pushes me – I look at the compass.  I am running straight for the Stewart Islands, hidden in the stratus.  The wind has shifted without me realising it.  We are certainly no more than 15 miles from the Stewart Island rocks.

I change course and see as many porpoise as before, but now they play with my boat fanned out ahead, in single file alongside swimming with their usual lithe, athletic  movements.  Then something wonderful happens: a big black porpoise jumps 10 or12 feet in the air in a fantastic two role somersault.  He lands flat with his tail forward and repeats this two more times bursting with tremendous joy as if he were shouting at me and all the other porpoises “the man understood  – keep on like that, it is all clear ahead.”

The porpoises keep with the boat for two hours when normally they only stayed with us for a quarter of an hour at a time.

They suddenly leave all at once, except that two stay behind for another three hours: a total of five hours.  They swim as if a little bored, one to the right an the other to the left of  the boat.  They are about three yards from the boat setting their speed by that of the boat.

I have never seen anything like that before.  Porpoises have never kept me company  that long.  I am sure that these two porpoises were ordered to stay with me until my boat was absolutely out of danger”.

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Editor’s remarks

This description comes from a sailor who was very experienced and had many sea miles behind him.  Moitessier was no dreamer, yet he reports this amazing event that underlines that amazing interaction between man and nature, that we seem so often to ignore and this site tries to investigate and publish.

If you have any stories like this I should like to publish them.

Richard Nissen

Posted in Animal Migration, Dolphins | Leave a comment

Miriam Liedvogel, CAnMove Centre, Department of Biology at Lund University

Miriam Liedvogel is currently working at the CAnMove Centre, Department of Biology at Lund University.  She has done extensive research and is a real expert on Animal Navigation, which is why she is one of our heroes.

You will be able to see much of her work on Google > Miriam Liedvogel.

She is currently researching finding markers to get a grip on understanding the underlying genetic architecture of migration.

Please see her latest research which covers the state-of-the-art of migration genetics in many taxa, not only birds - The genetics of migration on the move.

 

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BioNav RIN 13

The Royal Institute of Navigation Conference RIN 13 – Bionav – is the world’s leading Animal Navigation conference took place at the Royal Holloway College, University of London, Egham, Surrey, on 11-13 April 2013

Leading scientists from all over the world participated and presented their work. All areas of animal navigation techniques were covered, including, in some cases, their possible application to the control of autonomous vehicles.

Our editor Richard Nissen showed a poster which laid out a completely new approach to animal navigation and especially bird navigation developed by Jim Lyons and helped by Simon Raggett.  For further information please also see the handout

There were some fantastic presentations about insect navigation techniques of ants and bees all seemed to have important lessons for robot navigation.

With David Kaeys superb work showing that pigeons do not have magnetic particles on their beaks much effort has been spent looking at whether the Crypotchrome quantum free radical mechanism in the eye (studied by the Wiltshkos in the continental Robin) does in fact produce the compass information that birds need for navigation.

Groups from Pisa University  produced very interesting evidence that many sea birds  such as  Shearwaters seem to use olfactory cues to home

Miriam Liedvogel who has been elected chairman of The Animal Navigation Group explained more of her work on looking for the DNA markers that dictate migratory routes especially in willow warblers.

Posted in Sense of Direction | Leave a comment

Viking Sunstones by Tristan Gooley

The Economist have just published a letter I wrote to them regarding a recent academic article on Viking sunstones.

In the following letter I put forward what I believe to be an original argument on this popular subject. I have no way of proving this theory, which puts me in good company with the scientists who like to come up with new theories on this topic on an almost annual basis. I do at least know what it feels like to hear salt and ice fall from my beard, which may mark it as a little different.

Sir -

The Viking’s use of sunstones has captured the imagination of scientists more frequently than these stones may have been used practically at sea (“Crystal Gazing”, March 9th).

There are good reasons why sunstones are unlikely navigation aids, and equally good ones why they may still have been carried on ships.

Direct sunlight is not polarised; it is sunlight that has been reflected, refracted or scattered (hence polarised sunglasses are effective at screening out glare when sailing or skiing). In practice polarised light comes from a very different part of the sky to the sun itself, typically a wide band perpendicular to the sun.

I cannot envisage a situation where a sunstone would do a good job. However, sunstones may have been carried by Viking navigators for a different reason. Just as successful generals need their troops to believe they possess extraordinary skills, so navigators in the age before the compass needed sailors to believe they too had skills that went well beyond the normal.

My belief, formed in the North Atlantic and not the laboratory, is that the Vikings relied on the many clues in nature, including the sun and birds, to navigate effectively (see my recent paper, “Nature’s Radar“, for the Royal Institute of Navigation). They may have relied on the sunstone and other legendary routines and rituals to get people to follow them confidently in difficult conditions.

Editors comment:
We really appreciate Tristan Gooley’s comments and observations. We totally agree with the Tristan’s comments.  There are arguments that birds use polarised light to navigate with. I also do not agree with this idea.  It is too complicated,  especially with the sun around.

Richard Nissen
Editor

Posted in Bird Navigation, New Science Ideas | Leave a comment