The London Zoo is the world’s oldest scientific zoo. It was opened as a result of the Zoological Society of London (est. 1826), who opened the zoo in April 1828 to fellows of the Society, and it then was opened to the public in 1847. It is located at the northern edge of Regent’s Park, at the boundary of the City of Westminster and the borough of Camden. Notable animal residents of the zoo include Old Martin, a grizzly bear, who was moved to the zoo from the Royal Menagerie at the Tower of London in 1832 along with many other animals; Obaysch, the first hippopotamus seen in Europe since Roman times, who arrived at the zoo in 1850 as a gift from the Ottoman Viceroy of Egypt; and Brumas, who was the first polar bear successfully bred at the zoo in 1949.