Bernard Aimé Léonard du Bus de Gisignies (June 21, 1808 - July 6, 1874) was a Belgian politician, ornithologist and palaeontologist. June 21 is the 172nd day of the year (173rd in leap years) in the Gregorian calendar, with 193 days remaining. ... 1808 was a leap year starting on Friday (see link for calendar). ... July 6 is the 187th day of the year (188th in leap years) in the Gregorian Calendar, with 178 days remaining. ... 1874 was a common year starting on Thursday (see link for calendar). ... A politician is an individual involved in politics. ... Ornithology (from the Greek ornitha = chicken and logos = word/science) is the branch of biology concerned with the scientific study of birds. ... A paleontologist carefully chips rock from a column of dinosaur vertebrae. ...