The Language of Birds
The Language of Birds (more fully, Treatise concerning the Language of Birds) is a book of magic written by Thomas Lanchester.
"...There is nothing else in magic but the wild thought of the bird as it casts itself into the void. There is no creature upon the earth with such potential for magic. Even the least of them may fly straight out of this world and come by chance to the Other Lands. Where does the wind come from that blows upon your face, that fans the pages of your book? Where the harum-scarum magic of small wild creatures meets the magic of Man, where the langugage of the wind and the rain and the trees can be understood, there we will find the Raven King..."