He said: “The way birds navigate is that they use a compass and they use a map. The compass is usually the position of the Sun or the Earth’s magnetic field, but the map has been unknown for decades.
“I have found they are using sound as their map… and this will tell them where they are relative to their home.”
The pigeons, he said, use “infrasound”, which is an extremely low-frequency sound that is below the range of human hearing.
He explained: “The sound originates in the ocean. Waves in the deep ocean are interfering and they create sound in both the atmosphere and the Earth. You can pick this energy up anywhere on Earth, in the centre of a continent even.”
He believes that when the birds are at their unfamiliar release site, they listen for the signature of the infrasound signal from their home – and then use this to find their bearings.
However, infrasound can be affected by changes in the atmosphere.
The fascinating traditional process of making olive oil.
Emerson on Shakespeare and genius.
The Genius of our life is jealous of individuals, and will not have any individual great, except through the general. There is no choice to genius. A great man does not wake up on some fine morning, and say, ‘I am full of life, I will go to sea, and find an Antarctic continent: to-day I will square the circle: I will ransack botany, and find a new food for man: I have a new architecture in my mind: I foresee a new mechanic power:’ no, but he finds himself in the river of the thoughts and events, forced onward by the ideas and necessities of his contemporaries. He stands where all the eyes of men look one way, and their hands all point in the direction in which he should go. The church has reared him amidst rites and pomps, and he carries out the advice which her music gave him, and builds a cathedral needed by her chants and processions. He finds a war raging: it educates him, by trumpet, in barracks, and he betters the instruction. He finds two counties groping to bring coal, or flour, or fish, from the place of production to the place of consumption, and he hits on a railroad. Every master has found his material collected, and his power lay in his sympathy with his people, and in his love of the materials he wrought in.