The Goose Girl Fountain (Gänsemädchenbrunnen) displays a girl with three geese. Its creator was the Czech sculptor Antonín Pavel Wagner. The fowls refer to the first site of the fountain, which was the former poultry market of the city.
Today, you find this fountain next to the Rahlstiege, a staircase in the 6th Viennese district (Mariahilf). The traffic cone isn’t a regular part of the fountain. I guess the inspiration for this prank was the memorial to the Duke of Wellington in Glasgow.