Wang Xizhi loved geese and spent a great sum to buy a goose. But in the Ming dynasty Qiu Ying asserted that he wouldn't sell the mallard in the painting Duck by a River for 1000 ounces of gold.
王羲之愛鵝，願出高價買鵝；明朝仇英也說「溪鳧圖」裡的，可是只千金難換的綠頭鴨。