From top to bottom :
Northern Shoveler (琵嘴鴨) ; Snow Goose (雪雁)
Siberian Crane (西伯利亞白鶴) ; White Stork (白鸛)
27th September, 2012. Karachi
Do you remember the first day cover of The migratory birds in Pakistan ? Just posted on November. In here I would shown a set of maxicards of this issue. Although the first one has mirror mistake, they overall look beauty and attractive. Thanks Patrick to help me coordinate the cards.