William Thompson (2 December 1805 – 17 February 1852) was an Irish naturalist celebrated for his founding studies of the natural history of Ireland, especially in ornithology and marine biology. Thompson published numerous notes on the distribution, breeding, eggs, habitat, song, plumage, behaviour, nesting and food of birds. These formed the basis of his four-volume The Natural History of Ireland, and were much used by contemporary and later authors such as Francis Orpen Morris. Early years Thompson was born in the booming maritime city of Belfast, Ireland, the eldest son of a linen merchant, whose wealth would later permit Thompson to fund his own research without an academic affiliation. Thompson attended the newly formed Royal Belfast Academical Institution, where he got a degree in Biological Science. Founded by, amongst others, John Templeton, the school had a strong natural history section that produced a cohort of prominent naturalists. In 1826 he went on a Grand Tour accompanied by cousin George Langtry, a Fortwilliam, Belfast shipowner. They starting in the Netherlands then travelled through Belgium down the Rhine to Switzerland and on to Rome and Naples. They returned via Florence, Geneva and Paris. Thompson's first scientific paper, The Birds of the Copeland Islands, was published in 1827 shortly after he joined the Belfast Natural History Society. In these years he became a member of the Belfast Literary Society. Personal life William Thompson was a man of regular habits. For four hours after breakfast he was engaged in scientific research, preparation for the press and correspondence. Exercise for two or three hours followed. The interval between dinner and tea was given to the literature of the day and when the claims of local societies left him free he would retire to the study for two or three additional hours of scientific work. With spring came a visit to London where he enlarged his taste for literature, history, biography and the fine arts as well as science. He also visited most of the scenic parts of England and Scotland. In the summer the seaside with family and then in the Autumn tours with friends, attendance at meetings of the British Association and to shooting quarters in Scotland. Research Thompson contributed up-to-date information on the birds of Ireland to Selby's The Magazine of Zoology and Botany, The Annals of Natural History, The Magazine of Natural History, and the Annals and Magazine of Natural History, and