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
http://www.2physics.com/2012/10/avian-compass-reloaded.html Please find this interesting piece entitled The Avian Compass Reloaded by Dagomir Kaszlikowski at the Centre for Quantum Technologies, Department of Physics, National University of Singapore. Kaszlikowski talks about the the quantum effect that is required to enable the Cryptochromes in the eye of the European Robin to be sensitive to the earth’s magnetic field….
www.bbc.co.uk/news/science-environment-17855194 Please look at this link as it covers important ground on Avian Navigation. You will see that one of our heroes David Keays has established that the magnetite structure in the beaks of pigeons does not exist. The magnetic theory still has problems because you cannot navigate using a compass without knowing where you…
A little navigational help from animals. Tristam Gooley, who is one of our heroes, and a brilliant natural navigator have posted this fascinating link to his web site. You should follow this and delve into his other insights too as surely animals use many of the same clues as the ones that Tristan points out:…
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…
The Cuckoo is one of the migrants we know least about once it leaves the UK, however the BTO track, on their amazing site, the movements of five Cuckoos from breeding grounds in East Anglia to their winter quarters in Africa. http://www.bto.org/science/migration/tracking-studies/cuckoo-tracking Cuckoo tracking what we’ve learnt so far: http://www.bto.org/science/migration/tracking-studies/cuckoo-tracking/what-have-we-learnt Latest Cuckoo tracking news: http://www.bto.org/science/migration/tracking-studies/cuckoo-tracking/european-cuckoo-study…
Analysis of GPS recorded tracks of intact trigeminal sectioned pigeons. Conditioning studies have shown that the ophthalmic branch of the trigeminal nerve is functionally involved in the perception of the geomagnetic field intensity. However, homing experiments conducted in the field with homing pigeons demonstrated that trigeminal mediation of magnetoreception is neither necessary nor sufficient for…