This weekend is »Langer Tag der StadtNatur« (Long Day of Urban Nature) in Berlin. More than 500 events invite all city dwellers to discover Berlin’s green side. Some highlights are the nightly observation of foxes, boars and racoons in Charlottenburg, a guided tour to medical plants along Landwehrkanal and of course the urban gardening project »Prinzessinnengärten« at Moritzplatz.