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
This site takes you into the world where technology is trying to understand animal migration by using tags and a sophisticated satellite system to follow routes taken by animals. Up until now tags have often been very heavy, or at least too heavy for a lot of tiny birds that make huge migrations such as…
Following the 2016 Royal Institute of Navigation (RIN) Conference on “Animal Navigation”, Dr. Painter claims that after some 50 years of work, the Magnetic “mechanism is not fully understood”. In my judgment, it will never be, because there is no such mechanism. The Geomagnetic Field (GMF) is only a minor perturbation to the true navigational…
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…
Professor Kate Jeffery of University College London gave the annual address to the Royal Institute of Navigation (RIN) this year (2014). This article published in RIN’s Navigation News is, for me, a seminal step forward in describing the parameters of animal navigation and building a structure to delve deeper into how navigation might work. Her idea that…
In 1967 Eric Eastwood published a book called Radar Ornithology. Whilst research has moved on since then, this is a seminal book and gives really useful hard information on the migration habits of Passerines including thrushes, continental robins, warblers, starlings and woodcock. These birds make their migratory journeys to England in the autumn from the…
Intro I have put together this article to spell out some of the thinking that I have come across recently. A lot is highly contentious (such as Torsion waves) but as we struggle to understand how animals (and humans) navigate effortlessly, ideas which seemed so strong suddenly seem to be beset by impossible conditions. We…
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