A swan protects her nest against a dog. The scene was later turned into a political allegory by refering to the swan as grand pensionary johan de witt, protecting holland against the enemy. Object Type: painting. Genre: animal art. Date: circa 1650. Place of creation: Northern Netherlands (?). Dimensions: height: 144 cm (56.6 in) ; width: 171 cm (67.3 in). Medium: oil on canvas. Collection: Rijksmuseum. De bedreigde zwaan Rijksmuseum SK-A-4