William John Swainson FLS, FRS (8 October 1789 – 6 December 1855), was an English ornithologist, malacologist, conchologist, entomologist and artist. He was born in Dover Place, St. Mary Newington, London, the eldest son of John Timothy Swainson, an original fellow of the Linnean Society. He was cousin of the amateur botanist Isaac Swainson.
In 1816 Swainson accompanied the explorer Henry Koster to Brazil. They did not spend a long time on shore because of a revolution, but Swainson returned to England in 1818 in his words "a bee loaded with honey", with a collection of over 20,000 insects, 1,200 species of plants, drawings of 120 species of fish, and about 760 bird skins. (Read more...)