This paper is fascinating. This site has always been sceptical about Magnetoreception – the magnetic navigation story for the same reasons that are discussed here. No-one has found the magnetic receptors. the cryptochrome story requires conditions in the eye that are not conducive to quantum effects and knowing where North is does not help without a map showing where you are and where you are going so giving you the required bearing for navigation.
Useful links wikipedia.org/wiki/Swallow birdsofbritain.co.uk/bird-guide/swallow.asp Below is the of the swallow migration map: www.bbc.co.uk/blogs/autumnwatch/2009/11/lates… We, in Europe, measure the beginning of Spring by the arrival of the swallows. Many swallows make a 6,000 mile journey from Europe to winter in South Africa and back. I believe, that the way that swallows make this migration is by…
Article in Nature volume 18 number 4 April 2015 This is a very important piece of work which begins to bring us to an understanding how a sense of direction works and which is NOT magnetic based. We at animalnav.org know that this “sense of direction” must be crucial for navigation so Simon Raggett’s (one…
This link gives you a very good overview of the latest arguments about whether Cryptochromes, which are sensitive to magnetic fields and exist in the eyes of birds, help with their navigation. All the great and good involved in this field are quoted. I personally do not think that the quantum effects in a Cryptochrome…
Here is a fascinating YouTube video discussing different ways a pigeon might home. The people shown here are our heroes, who are really important people in the animal navigation world and especially in Pigeon navigation. You will find Tim Guildford at Oxford University, who believes that pigeons follow landmarks, The Wiltchokos who believe in magnetic…
Please find this PDF which follows a lot of research on Albatrosses. This presentation throws up some really interesting issues. I feel comfortable that albatrosses when they decide to go home follow their sense of direction to their home islands in the South Atlantic: the Crozet Islands and Kerguelen as they fly straight there. However, please…
We know that cuckoos nest over winter in the Congo and breed in Europe. UK cuckoos arrive in the latter part of April and lay their eggs in another bird’s nest. The common host of cuckoos are Reed warblers, Meadow pipits and even non-migratory Robins. The juveniles a month later in May. The fledgling casts out the other…