The crane, an important symbol of longevity in China, is often shown alongside the strong and long-lived pine. A very similar but larger (43cm.) single model is in the British Museum, Ancient Chinese Trade Ceramics, Taibei, 1994, catalogue no. 90; another, smaller and plainly coloured, single example in the Copeland Collection is illustrated by W.R. Sargent, The Copeland Collection, Salem, 1991, p. 165, who discusses the history of China trade orders for the waterbirds. M. Beurdeley and G. Raindre, Qing Porcelain, Famille Verte, Famille Rose, London, 1987, p. 108, note that these birds must have been made also for the Imperial Palace, citing a May 1742 entry in the notebook of Tang Ying (director of the Imperial kilns 1736-56) reading: "Received an order to make pairs of storks that should be depicted viewed from the front."