Richard John Ussher was an Irish

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

 ornithologist.
Ussher was born at Cappagh House, Cappagh

Cappagh

Cappagh is a small village in County Tyrone, Northern Ireland. It is between Pomeroy, Ballygawley, Galbally and Carrickmore, with the hamlet of Galbally about one mile to the east...

, County Waterford. He lived mostly in continental Europe but in 1866 he returned to Cappagh, married and thereafter divide his time between Ireland and Europe. He was initially interested in oology

Oology

Oology is a branch of ornithology studying bird eggs, nests and breeding behavior. Oology can also refer to the hobby of collecting wild birds' eggs, sometimes called birdnesting or egging, which is now illegal in many jurisdictions.-As a science:Oology became increasingly popular in Britain and...

 but later joined the Society for the Protection of Birds. He is best known for a seminal work on Irish birds written with Robert Warren

Robert Warren (ornithologist)

Robert Warren was an Irish ornithologist.Warren was born in Cork. In his early years he corresponded with fellow Irish ornithologist William Thompson. In 1851 he moved to Moyview, County Sligo, where he studied the birds of Killala Bay, Bartragh Island and the River Moy. He was co-author with...

-The Birds of Ireland. An account of the distribution, migrations and habits of birds as observed in Ireland, with all additions to the Irish list. Gurney and Jackson, London. (1900). He was one of the first authors to contribute to the Irish Naturalist

Irish Naturalists' Journal

The Irish Naturalists' Journal covers all aspects of Natural History and has been published since 1925....

 (1892 The crossbill (Loxia curvirostra L.) in Ireland. Irish Naturalist 1: 6-9). Ussher studied the fossil remains of extinct avians and mammals at cave sites in Cos. Cork , Waterford , Clare and Sligo in company with English (Henry Seebohm

Henry Seebohm

Henry Seebohm was an English steel manufacturer, and amateur ornithologist, oologist and traveller.Seebohm was born in Bradford. His interest in natural history led him to travel widely, in Greece, Scandinavia, Turkey, and South Africa...

, Howard Saunders

Howard Saunders

Howard Saunders was a British businessman, who later in life molded himself into a noted ornithologist.-Biography:...

, Andrew Leith Adams

Andrew Leith Adams

Andrew Leith Adams was a Scottish physician, naturalist and geologist. He was the father of the writer Francis Adams.-Life and career:...

), French and German ornithologists and vertebrate palaeontologists.