Busard cendré
The "Ornithological Dictionary" is George Montagu's best-known work, and the one that established his reputation as a pioneer of British ornithology. He compiled the book at his home Knowle House, near Kingsbridge in Devon. It was published soon after the first volume of Thomas Bewick's illustrated handbook, "A History of British Birds", which appeared in 1797. It does not describe what is now called Montagu's harrier, which he separated from the hen harrier in 1803, after the publication of the book.