Alexander Koester's specialisation in the theme of ducks makes him one of the greatest animal painters in the history of art. In a late Impressionist manner, he virtuously reproduced reflecting water surfaces and duck plumage shimmering in light and shadow. This made him successful. In 1904, Koester was awarded a gold medal at the World's Fair in St. Louis, and he received another gold medal from Prince Regent Luitpold of Bavaria. Starting in 1908, the artist regularly visited Lake Constance to paint large expanses of water in all kinds of weather. Today, Koester's paintings are sought after by collectors from all over the world and constantly achieve new record sums at auctions.