断鹤续凫（斷鶴續鳧）　

◎ 断鹤续凫 duànhè-xùfú

[try to shorten the neck of a crane and leugthen that of an owl] 凫∶野鸭。截断白鹤的长腿,接到野鸭的短脚上。比喻违背自然规律做事

断鹤续凫,矫作者妄。——《聊斋志异·陆判》